I honestly don't like the spheres thingy, the don't feel like part of the background. The backgrounds you added text in it, the text (Font) looks ugly and awkwardly positioned. You could use more work with the poses and camera, of course shaders look good, try to add something more beside a screenshot and some minor effects on top of it.
Things you could improve:
•Poses
•Camera view
•Effects
•Fonts (text)
, etc
Anyways, that's my opinion.
Hope to see more.
Good luck!