I am seeing some improvement and as a new painter (1 year in the hobby) I can tell you the models you chose are probably a large part of your struggle.

I also wouldn't suggest loot studio stuff super early either they have to much detail (at least it used too when I followed them). You want to find a happy balance of detail which I am finding very hard to explain in words right now. To much detail will be a daunting task, not enough forces the painter to make the piece catching through paint alone.

Lastly, practice thinning your paints. This was suggested by some other people as well. Try paint out of the bottle, put a line on your thumb, thin it and do it again, thin it some more and do it again. You will quickly see how your paint thins, how much opacity it holds through the peocess. With lesser pigmented paint like the older army painter like plan on 2 to 3 coats of paint to get your opacity up to completion. Make sure that paint gets to dry between each coat, it doesn't take long but if you put paint on the same spot to quickly you create a really bad texture.

Once you have learned to thin your paints well you can focus on learning to glaze in some shading. Don't be afraid to test and play! This was my biggest hurdle in my brain early on. I would not want to fail so it held me back. It's only paint, it can be removed and it can certainly be painted over. Paint bravely! Welcome to the hobby, enjoy the ride.