This is an illustration for my story about two twin brothers, Jimmy and Billie who is born with lycanthropy. http://www.furaffinity.net/view/11304891/
Their father is one too, but can't turn into what they call a Therian (Beast-form in my story, because the Greek word theríon means "wild animal" or "beast") he can only turn into a more humanoid form of a Lycan (less hairy and not bigger than their human form.) http://h-m-m.deviantart.com/art/Moo.....9&qo=2
A werewolf can't turn by their own will, but a shape-shifter Lycan can. In my story, they can also turn into a 'feral' form which is called Waer ( Wær ) http://www.furaffinity.net/view/11300824/

I like werewolves/lycan's that have more human/primate like features. So this fella would walk similar to a gorilla when it's down on all four.
And its roar is like one of a gorilla's. http://youtu.be/miXPS2AI8b0 When it howls, it's deeper than that of a wolf, similar to a territorial roar of a lion. http://www.youtube.com/watch?v=3U6prrWmneQ

I should say, in the story, Jimmy and Billie are about 1.75cm tall, and in this therian form they're about 1.85-90 standing on their hind-legs. So they just get a little bit taller than in their human form.

The anatomy isn't the greatest but it's just a detailed sketch, because I just wanted to put my idea on the paper :)
Hope you like it!