Dude on a one wheeler sketch

Sketching a quick sketch of a dude riding a one wheeler to show a friend what sort of one wheeler I had seen the other day in Gothenburg. The intention for the sketch was first to be purely communicative, but since I made it quite fast it got a nice touch to it, so I kept working on it and added some shadows which is all very quickly done, but fills it's purpose. I'm starting to realize that really most of the times it turns out better if you work quicker.. The point is not to get a perfect sketch in the sense that every line is perfectly aligned to the next, but to communicate a feeling and a message to the viewer. Then, after you get the proportions more or less right by sketching the whole form, or motive, really quick and messy, then you can wither make a new layer and trace the first sketch, tone it down, or just add some descriptive stronger lines that defines some more important details.