Vroom Vroom

The picture's a bit blurred so you can't really see the motorbike properly which is a crying shame because you've got effects of the metal's reflection at the right angle and your shading shows that.

But the wheels need to be darker as I'm sure you're aware that the bike wheels thend to be darker then the car or motorbike it self, you can barly see the metal lines that hold the wheel on mainly because they're very faint, but I like how you've done the shadow underneath it adds to the picture^^

Overall it's a good piece and I look forward to seeing your next piece but just remember add more shading in the future.