Your lineweight is very chicken-scratchy and static. Theres no variations in line weight, no focal point, and the perspective on the back wheel is totally botched. A lot of the details suffer from bad perspective (like the front wheel arch which isn’t actually round?)
Your coloring itself was fairly good - but again there is no focal point, and the background really ruins things for me. The solid color with the really strange shadow (square shadow) is distracting.
I think the biggest difference in your overall technique vs the winners is that they focused on doing loose and quick styles - whereas your style comes off as rushed, not loose.
The overall design has some nice elements - very Elise-ish.