Concept art?
Not bad, not bad at all, though I believe it could do with some refining.
I love your lighting, it looks really good with the sparks and the blue light in the back of the robot's head, as well as the shadowing. It's easy to see where the light source is.
The concept is pretty cool as well, but the whole thing looks like concept art rather than a finished piece. It's not very clear, the lines aren't very smooth, and the coloring isn't the best.
It's also very difficult to see exactly what's inside of it's head, which you could do something with, I'd like that. Some detail to the piece would be nice, as there seems to be some lack of it right now.
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