Shut up. He can draw whatever he wants. Let's think for just a moment that MAYBE he draws for HIM not for you, and let's also think that MAYBE a shitload of people asked him to make this tutorial? I know it's just SOOOO silly to think that.
Mostly looking at the angle of this and the great depth to it, it could be adapted to create some really expressive alien type mouths, or unusually styled expressions. There's a lot of potential with this.