Fw-190 engine detail drawing

Trying out some sketching in sketchbook pro. Found this photo in a book about the Focke-Wulf 190 fighter from WWII. The ground crew guy was on top of the engine cowl waiting for the front armour flange to be installed. The dude didn't look happy.

I think I captured his scowl pretty well. Made me wonder what the back story was....did he not like having his picture taken?..or was he mad at the photographer for some reason?? Who knows....Either way...I'm sure in about 2 days I'll hate this drawing no matter what the guy was thinking.

neat photo of the front of my favorite German fighter though :)