Environement study

[Theory2D]

Well, I can say that you are going for some really dramatic perspectives which I do like! I would also say that is probably what you will want to hone in the most. What I am getting right now is that they're thumbnail sketches, so really preliminary stuff. Yet the purpose of doing that is really to knock out the fundamental problems like composition, lighting, perspective etc. There is an excellent book by Scott Robertson called How to Draw, but its main focus is breaking down the specifics behind perspective. Even though he gives it to you very scholastically (part of his Art Center curriculum) and in the pencil and paper sense, it can be applied to Photoshop and once mastered, can be used to do just about anything design wise.

There's also a youtube series with perspective shortcuts by Jordy Lakiere - kind of a quick way to get the look without knowing all of the technical aspects, but I would recommend the Scott Robertson book too to get the total foundation.

https://www.youtube.com/watch?v=EjkmuWhd9e4

Hope this helps!