Why not do a wookie themed car instead. I don't remember seeing any hairy brown cars aside from the dog car in Dumb & Dumber. ;)

Sad face.

What about this:
https://scontent-sea1-1.xx.fbcdn.net...28836199_o.jpg

I think your rendering looks good. Dunno that I'd think"storm trooper" when I saw it, but it definitely looks good. The black tape you tried... not so much. Keep at it you'll find something