some of my old stuff I did back in the day.

these are really good, i like the scar face one the most.

blend in the renders . most of em look like you just sprayd a brush as the background and slaped the render in .

Apply some of these ideas to your images:

Flow, images should have one or two directions in which the action is clearly flowing

Color, try not to use colors that conflict to much, as it can make an otherwise good image an eyesore

Depth, without depth, images seem flat and tend to loose interest

Focal, the render should be the focus of the image, it helps to have the flow pointing or centered around the render.

i like the assassin's creed one

Wow, nice stuff!