Feeling bad for the little guy, I went on to tackle the deep question of all flashers down the centuries:
Beige trenchcoat or yellow plastic raincoat?
Consultation with 
Editor in Chief Bill 
led to...
Shading with Reaper Master Series Orange Brown and "new" Reaper Pro Paint Deep Yellow. Highlighting with Reaper Master Series Lemon Yellow resulted in:
...and he's pretty much done.
I decided to keep the drastic (for me) outlining to keep him "cartoony" looking. (He's got no naughty bits, after all!)