Here's something I did rather recently, before my recent awful art-block. It was difficult at first, painting on black isn't something I'm familiar with so at times my process had to go in reverse. I'm happy with the result despite how well it makes clear I'm a painty guy rather than a designer.

You can find the book here: http://www.rabbitvalley.com/item_84.....he-Gifted.html

I haven't read it myself, though I hear good things. Check it out!