Great model!
One small nit-pick, though.
Just to make it a little more interesting, I would suggest moving the rotor so it's not parallel to the tail. Or, you could replace it with a plastic disk streaked with sharpie marker to make it look like it's moving.
As for a backdrop, knock yourself out. Just get a piece of thin wood and paint a gray sky with streaks for rain.
''Do your damndest in an ostentatious manner all the time.''
-General George S. Patton