Hey, this is bradley here
I know what you're talking about. I think reading the article will help, she explains exactly how to do it with info and some pics. I don't remember exactly how to do it but you must create a dark wash and dry brushing. I do know you need brown, black, red, blue, and steel paint and it involves dry brushing.
I hope I was some help
Don't give up, it really is a really amazing hobby if you take your time and practice, the results are amazing, trust me!