If you are interested in the style pick up a fine bristle paintbrush with a pointy tip, some indian ink and some watercolor paper. Bring the brush down on an angle until it touches the paper then drag it away from that point while bringing it down further making the line feather like a kind of point, repeat. All other linework is self explanatory. I think speed painting videos are weird because its just a sped up video. Whats the deal with that? People cant move that fast, it should be called sped up footage of some guy using photoshop ha ha. Anyway the style is really easy if you know how to paint, if you don't it just takes a little practice. The real trick is to learn lighting and composition which I am still doing.