http://i14.photobucket.com/albums/a349/britte/crouching.jpg
Here's a good crouching position.
Except the one hand will not be behind him, it will actually be outstretched infront of him, like that one reference picture that I posted that also shows how his wings are. (http://i14.photobucket.com/albums/a349/britte/Demetriuswings.jpg )
Also, stick with the initial expression and body language of the first reference position picture I gave you.