woohoo

The render can be blended in more, colors are fine some c4ds would help with the flow, the sig a bit to big for that render work on lighting depth, you are getting there read some more lighting depth and blending tut, try to add some effects if you moved the render to the right it would look better.

I think it look's wicked!
Very good work :3

when you say the render could be blended more... what do you mean? and how could i fix that?

Its kinda hard to explain look up tuts, but ill try to explain, Duplicate your render 3-4 times and start smudging the borders of the render and put it at Linear Dodge and Color dodge, then just smudge the top render layer a bit and keep it at normal, also the colors help the render blend well too, use different adjustment layers.