What advice can you give to someone learning digital painting?

All I can recommend is what works for me – which is to practice regularly. If you aren’t satisfied with what you’re making, take the chance to deconstruct¬†why, and try to improve those areas. If you do that daily and make small changes in your technique, eventually you’ll develop a style you’re more happy with. The key is just to do it often, and iterate quickly. Check out this talk I did at PechaKucha for more of my thoughts on daily sketching.