Just want to point out some texture issues:
1. middle (your screen #1) - that trans33 on metal is a nice idea, but just doesn't look right. Maybe just make it opaque?
2. starting position (my screen #1) - replace the brown bricks with red ones.
3. middle (my screen #2) - rotate wood textures A and B by 90 degrees so they line up with the middle ramp. Leave C and D alone