We don't carry Digital Artist so we're not the place to ask about that one.
A lot of tips, trick techniques can be picked up all over the net. I've used Photoshop for nearly 20 years now and still learn new things all the time. I think exploring and experimentation is the best way to learn how to take the tips you've learned with brushes and masks and make them into techniques for altered art! HTH!
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Katie - owner of DesignerDigitals
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My Blog : Documenting + Designing
Camera: Nikon D700 with Speedlight SB-600
Lenses: 16-35mm F4, 24-70mm F2.8, 70-200mm F2.8
Software: Adobe PSE3 and CS3, Illustrator CS3
computer platform: Mac