Heya, I really like the amount of work you put in and all the different ideas you come up with.
One thing that all your pieces have in common though is that you are still lacking in fundamentals. For example I couldn't find any 1-point-perspective assignment. While your 3-point-perspective assignment looks kinda cool, it is very clear that you don't quite understand it yet.
I'd really recommend working more on the basics, that'll probably give you the most return for the time invested.
Looking forward to your progress =).