Students (and teachers) may be interested in this series of tutorials for digital painting in Photoshop offered by Ctrl+Paint. Description:

Are you totally new to digital painting? This Digital painting 101 series is a great place to start. I teamed up with Lifehacker.com to create this 5 part introduction to painting in Photoshop. The first four sections introduce the layout and tools, and the final video is a narrated painting demo to put it all together.

I don’t have permission to embed the videos, but do check them out.
Found via the Drawn blog.