A walkthrough showing the steps for my recent painting found here [link]
I happened to save regular back ups of this so i thought i might as well make a tutorial! I used Photoshop for this but really my painting method applies to any digital software.
I hope this helps in some way and gives you some useful ideas. Feel free to ask me anything about it, especially if I've missed something
Oh and i hope you don't mind my walls of text...