Self explanatory. Yes, that is duct tape.
There's a complicated ref sheet with a complete turnaround and an age progression coming up. I've been sketching it for the past hour or so. He also has an ask blog, if you're into that sort of thing.
http://asktwiddlefix.tumblr.com/
In my experience, pony blogs lots of goodhearted fun and an excuse to goof around with art. I wholey recommend it.
Link
oddeofreq
i would like to meet this Twiddlefix.