I'm still struggling with the manual mode.
Just now, I was so pissed, that I stopped doing my work. Instead I covered the monitor with a bed sheet, and took the three colorful baskets of Eva's and Tom's wedding and shot a LOT of pictures. Although I did it systematically, I didn't cared for the set and the perfect light (I can't change sunlight) . I just cared for the exposure triangle.
I'm not pleased with the outcome. Either it's something wrong with me or the camera (this, I fear most!)
When shooting in the manual mode, there are so many variables, it takes a concerted effort to become happy with your setting choice decisions, but well worth the trial & error experimentation. Luckily, with digital cameras, the learning curve is much more tolerable, due to the instant feedback. Life is for learning.....no???? I never want to try to monetize my photography, because I want to have the luxury of doing what I want, when I want.......When $$$ & deadlines become of primary importance, the fun and wonder starts evaporating pretty quickly, at least in my case...........
I played very systematically with the variables, but forgot to use a
tripod! Can you believe it? I'm such an ****. At least I'm glad, there
is nothing wrong with the camera - it's just me ... 
I try to be sure my shutter speed is fast enough to avoid any blurring where blurring is not wanted, which means I'll have to open up the iris or up the ISO in order to gather enough light for the image, which may present problems as well, such as unintentional focal point or excessive "noise".......It's always a delicate balance in almost every case, but that's what keeps it interesting, for me.....
It's always easier and less "soul crushing" to blame our equipment rather than to accept the fact that it was, once again", "pilot error", instead...................No????
There's something wrong with the light.
Ok, let's pretend you didn't used the flash on #2 (Bad Sigrid! )
Colors of the basket are too bright and dark. Light source on the right is too bright (Compared to the dark side on the left), and, in my humble opinion, there's too much depth.
How to solve this? I have no idea!
But when you find out, please write another post, and let us know!
Congratulations Tom and Eva 
It is easy to solve the "no problem at all", if I would have used a tripod. I'm such an ****. Using the flash was just part of the systematically shots. Btw. I didn't cared for composition and the light because I only wanted to test the dof and took some clear/sharp pictures (without tripod ... *sigh*)
These are well exposed. The shutter speed in a few of these is a bit lower than I am capable of hand holding with my current body and the iso looks like it is in a reasonable range for the other two components of the shot settings. Honestly I think you are on the tract of nailing the manual shots. What about it is frustrating you the most?
Mostly I'm frustrated about myself. I shot a lot of pictures - all of them very systematically but I forgot about the tripod-factor. I didn't use a tripod ... *sigh*
Must say I like them. Color is good, lightexposure has to do more with the daylight than you. you can play around with method of exposure, zone, point or complete screen. I think this was not the best lens for the job. If you have the kit lens or a 50mm prime, try that one. As you zoom in with your 28-300mm than also it changes the min distance you have to keep from your subject. Just keep playing around in manual, you get there. You are using AF, that is not always on the correct point you want it to be, I know you have the same problem as me, bad eyesight and glasses. They are not as bad as yoy think and it is not esay to get the picture that is in your mind.
Keyword: tripod. I'm an ****. No, there is nothing wrong with the camera - just with the owner ...
I am not sure what your frustration is. If it's the colors, they look fine to me on this screen. If it's something else such as focus then you need to explain. I looked at your exif, one question I have is....did you use a tripod? If so then I am not sure why on some it's not sharp, if you didn't then I ask why is your shutter speed below your focus point for example on # 2 your focus point is at 28mm and you shutter speed @ 1/15. Always told that shutter speed needs to be above the focal point if hand held because the slightest movement including the movement of the mirror causes distortion. Heike's advice is also a good one, using auto and then coming back and resetting in manual with the "auto info". Another thing I should add, the 28-300mm has it's sweet spot around F/8 although at f/5.6 it does very well as well.
Exactly, I didn't use a tripod ... *BIGSIGH* My best friend - I call her the goddess of stills - already pointed out my biggest mistake.
I like the cheat card a lot, which Heike recommended, although - of course - I knew about the facts.
I'm acting like an overprotective mother hen with this camera. Since the sensor cleaning I developed something like a "Münchausen Syndrom". I should begin to calm down and starting photographing instead ... 
I find it rather funny Sigrid because everything you have described, so far I have gone through at one time or another. Right now I have two dust spots that for the life of me I can not remove. I have blown, I have used the special Q-tips...they move from here to there but not out. So I have talked myself into not giving a F.... and just cleaning them post. Somehow we all become very obsessive or at least I do and then I see these people walking with the cameras just dangling on their back and letting the rain get to it and not giving a shit and wonder " What is wrong with me????" 😜
I don't see the problem, except maybe for a composition one. But #4 is even good in that aspect.
I didn't "waste" my time with composition ... I just wasted my time not using a tripod. I'm such an ****. No, there is actually no problem - at least I'm glad about that fact. 
I am confused, these are very well exposed. Is it the art you are not pleased with?
I just tried to find out, if there would be a problem of dof or my fault to produce a clear/sharp picture. I already talked about it with my best friend. She is a specialist in stills and of course she saw in an instant, that I didn't use a tripod.
I'm an ****.
Mir gefällt #2 am besten. Weisst Du was ich in so einem Fall mache, ich schaue mir die Settings im Automatic Mode an, mach ein Foto und fange dann langsam an, die einzelnen Werte zu verändern, je nachdem wie ich es haben möchte. Ich weiss, der Automatic Mode ist uncool, aber mir hilft dies Vorgehen. Hilfreich finde ich übrigens auch diese Cheatcard:
https://www.hamburger-fotospots.de/kostenloser-download-foto-cheatcard-fuer-fotografen.html
Ja, das habe ich auch gemacht. Ich habe hier nur die, die ich ganz gut gefunden habe, gepostet. Und danke für den Cheatcardlink. Natürlich weiß ich das, aber nichtsdestotrotz ist der Spickzettel echt Klasse und macht das Leben mit Kamera einfacher. Ganz ehrlich, Ich h#tte ein Sattiv nehmen sollen und es hat sich gerächt, dass ich zu faul (oder zu überheblich) war ...
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You seem to be having a Metallica moment...
... always ... 😉
In August I will hear and see Metallica in Happel Stadion here in Vienna. 🤟😎👍
Hope you get to see Kirk playing his $2m Gibson. He seems to favour it on Fade to Black.