These guys are often the only subjects around, and I think you came away with something interesting. The face is sharp as can be, and I like the OOF flanks/wings in front and behind.
Fluffy bit of down in front of face adds interest. Looks great for ISO 500, though proximity certainly helped.
Nice one Andreas the limited DOF is ideal and the details are super. I think you lens is Ok, I suppose the guy behind the camera wasn't too bad either.