Awesome walkthrough, with a kickass end-product!
(I've always loved Doomsday, too)
I'm really going to be studying this closely, because I'm trying to shake the habit, or at least branch out from my style of black-ink articulating every detail and shape of a character. What I do is really comic-booky, and I'd like to do something like this. More "Fine Art" illustrations.
The double light-source does wonders for the characters dimensions, and there's no flaws I can find. He looks ready for League of Legends. TEN OUTTA TEN, and fived!