I think you could of done more with this? And its seems unfinished, unbalanced and wrong to me. I think its mostly because of colour choice really, look at 1ups and how he uses colour to show detail. But your biggest problem is form as the centre of balance is all wrong!!! Proportions seem right, but I'm going to say it a again...the colour bothers me! I think its your dark tone really. Enough said. Redo this please....for your sake, as it mess up the standard you set yourself with your other work.