I like it alot, but some places do look a bit... Sketchy, like Lines that arn't straight, circular objects like the tire that arn't circular. Add some shadows to it, that will make it look much better, and tidy up the logo... It looks like a lion not a horse
I have to admit that I did rush a few things, but the only reason I did that was to try and get coloring down. As you can see I suck at coloring and want to get beter. I'm also working on doing that shadow, I messed up on that shadow on this card cause I added Gaussian blurs to it. Next time I'm going to take my time on the vector and make sure it doesn't look choppy.
The main part that I think could use some more work, is the rim. Its allot larger on the left side and very thin on the right side. Thats the main thing you could work on.