I've got no time to add a decent description, as well as fix obvious problems in the piece (bad shading, lack of AA, banding and other techincal things I don't understand, and also there might be similar colors), so it's going as it is =/
The curupira is a character from the brazilian folklore, and is basically a defensor of the forests. Whenever someone does some harm - or tries to - to any of the natural elements of the woods, this leprechaun-eared, cool-haired boy (some versions even say his head's on fire) suddenly shows up to kick some ass with his inversed feet, and then runs away mounted on his personal demonic boar, or even better, use his peculiar anatomical feature to confuse the wrongdoers when they go after him and see the backwards steps. Well, at least while they don't notice it.
I see the interaction FG-BG is a true mess, but I really wasn't able to do anything better with these colors, time and skills. Well, I think it looks less messed up in 2x.
Hope you like it =) (Or at least don't hate it!)