We've speculated before about what artists could do with the iPad's bigger screen, and here's an answer. In the video above, portrait artist David Kassan uses the Brushes app to create a painting from a live model. I don't know what the fingerless gloves are all about, but you can definitely see how the iPad helps -- he can make bigger swipes across the screen, match colors with the extra screen space, and run touchups on a few different parts of the work at a time.
According to the video's description, the whole thing took about three hours, and the end result looks great. I like one of the YouTube comments on this one, too: Who needs a camera on the iPad, anyway?