One nice thing about Nintendo DS is its portability. I put it in my pocket and will be able to paint anywhere. It's light weight, and good battery life too. Although it takes a little getting used to small screen to paint on, I think I'm slowly getting a hang of it. I tried something really quick but I didn't finish it, so the painting is looking rather cruel at the moment.
The next picture is just an experiment coloring from one of the panel of Transformers: Devastation #5.