I've found myself playing a lot of Mario Kart DS lately. It can be sort of addicting. I ended up sketching Mario, and he's pretty fun to draw. There's a few things I think could still be better about this piece. For one, I wanted more line of action to show up in the characters, but it got a bit lost when I added the blocky karts. The sense of movement also isn't quite as fast as I envisioned. I didn't spend enough time on the background, so it's a little boring. Line work could be better too. Beyond that, I'm pretty satisfied with the volume, detail and likeness of the characters.
Here, also, are some of the warm-up sketches:
