Anyways, I made quite a bit of progress. I coated the models with Macharius Solar Orange then washed them over with Baal Red. I then picked out all of the scales with Chaos Black and rewashed the scales with Baal Red.
I'm planning to go through and highlight the scales with some sort of grey. I haven't decided what kind yet but I'll probably do some experimentation. I'm also planning to highlight the skin with Blazing Orange and possibly some form of yellow.