Here's a little test done with my latest iPad painting app - Procreate. It doesn't have loads of features but it does have some great brush creation controls and a nice simple interface. This was done entirely on the ipad - starting with a quick zenbrush sketch...
... and here's the Procreate part. The app allows you to make your own brushes using images for both the shape and texture. It also has layers and is reasonably fast. The new version will apparently be higher resolution - which is good. It costs $7.99...









