I got to agree with Kalico, the perspective and whole structure of the background is amazing. Other than Kalico though, I do think the people fit well in the whole picture. They share the same use of colors and sketchyness, plus there's a pleasant level of simplicity that causes you to not only focus on them, but to really enjoy the rich and detailed background (which is obviously a good thing). The only minor negative thing that catches my eye is the purple smoke coming out of the blue scooter; it's too smooth and too bright, while for instance the yellow smoke of the right scooter is ok (maybe a little too bright as well though).

All in all, this is a fantastic wall, that definitely deserves to be faved by me ;).