it looks realistic, though the shot design is a bit messy. Try removing the bright light on the right. I think the scene would be more pleasant to look if you did that.

really great!

Not agree.
The light source on its place.
Without it light-source the scene is got overfilled by black colour. Too much.

Excellent lighting and textures. +9

but it is in a distracting position. Something you might have wanted to resolve earlier in concept painting stage, before manipulating photos together. It is way too distracting, all you can do is to stare directly into the bright light, which is not fun because then you're not looking at the rest of the scene. Add different light sources if you have to but do get rid of that one.

earlier source of the light was more, but I have advised their take away, and after determined debates I agreed that without them better.

The initial variant you may see here:
http://www.mattepainting.org/forum/viewtopic.php?p=17716#17716

Sure looks real and like a photograph!....well done!
Carlos

erm.. dude didn't you post in the wrong category? cuz this seems like a photo manipulation to me and not painting at least from what i see in the full version oO