Text is the concern on number one (i'd stay away from a drop shadow completely.) Also blending the Render. It just kinda stands out at this point which is not good. Stock work in the BG is solid.
750K
2nd one, love the text, get rid of the drop shadow on the render, also it looks super oversharpened on the render. Don't do that. Like the concept, just needs a few tweaks.
750K
Like this one a lot. Text work on the BG is done really well. Text fits. Only thing is blend the render! I think a splat in front of him does the trick.
750K
Last one, Render is WAY oversharpened again. Stop that. Text is pretty good, like the blurring you did on just a piece. Background fits nicely.
750K