Tutorials for digital painting?

I’m having a hard time with digital painting. I only do good from sketching to blocking in my base colors and after that everything looks like a disaster. Are there any precise tutorials or articles out there on painting methods/ workflow?

http://www.blender3d.org/e-shop/product_info_n.php?products_id=122
view on youtube: https://www.youtube.com/playlist?list=PLDA4F7818DEE29414

Head over to Matt Kohr on Vimeo LINK - lot’s there to absorb.

take care

Thank you. Ctrl+Paint is really good.