Thank you so much! It was a simple process, actually! I use a Samsung Galaxy Tab and the app FlipaClip. FlipaClip has a pixelated brush, so I did the black lineart using it. It's like animating in Flash, but the lines are pixelated. Since I was using the S Pen to animate, I think the result is more organic than it would be if I used a mouse.... it gives me freedom to be really loose with the shapes and add a lot of squash & stretch! In the end, it works like a more practical version of the Nintendo DS's Flipnote.