concept art tutorial for photoshop. I especially like the step on getting rid of grayscale, that'll save me a ton of time.
Sansa: digital painting process from http://aarongriffinart.deviantart.com - Imgur
Audrey Dutroux6 Illustrator Audrey Dutroux
25 Digital Painting Tutorials
Digitally painting a realistic portrait. Massive Face Tutorial 2 by *gothic-icecream on deviantART
Oil painting. Gorgeous #portrait #inspiration
Digital Painting by Jeff Langevin, via Behance