With advanced brushes and complete gradient tools, the painting options inside of Pixelmator are very useful. Inside you'll find a wide array of tools for painting and drawing. These can also be used to create hand-painted masks of dodging and burning as well as image effects.
This tutorial is a single movie from the Up and Running with Pixelmator course by lynda.com author Rich Harrington. The complete course is 3 hours and 33 minutes and shows how to get up and running with Pixelmator, a full-featured image-editing tool for the Mac.