I actually quite like what you have done

It's a pretty cool idea.. and the overall result for the street bike is great, at least in terms of design. Might it look even cooler if the rear wheel was a bit bigger and wider? Then it would look even more aggressive.
I think the main problem with this chop and what lets it down the most is the choice of background

It fits really well, but the lighting and reflections on the bike make no sense. As a result, the bike looks out of place, and much to bright for this background.
You would have been better leaving it with studio style surroundings, however adding in some other details rather than just having the plain white like the base. This chop from asoares shows the kind of effect I'm suggesting:
http://bit.ly/L7HqAU
So maybe think about that next time, and concentrate on making the vehicle look 'at home' in the background. And remember, chopping isn't a race, feel free to take as long as you want, and stretch yourself a little each time

This is the best way to keep improving.
Keep it up though dude
