Whoa! How interesting. The wrinkles look so simple, yet they make sense, like you said you noticed. It's really odd, and I'm glad you found out how to do them.
Haha! It's so fun to rediscover your own style. I guess I'm sort of going through that with HTTYD. Now all my posted drawings are shaded, which I barely did before. And don't apologize about long comments! I love them. In discussion boards, I'm always the one with the hugest comments.