oh nice. sprite looks a tad lq, maybe oversharpened. Maybe make more of a focal with burn/dodge, looks good though!
i like it, but i feel if the sprite was actually on the track and no c4d in front of em with some of the bg on that side light up a tad more it would have a full 3d effect, and reduce the contrast on the sprite to better blend into the enviroment >=)