Ahhh, I'm excited for the game too, and I haven't even played many Zelda games! I share your pain in having to buy the Wii U late.
I think the shading you did was really great! Having the source of brightness on the right really helps add to the resolute countenance on Sheik. I feel it adds an extra sense of depth (literally and figuratively!), so good job!
that does make sense XD but i read the manga before i played the game and in the manga zeldas consciousness was "erased and replaced with that of the guy sheik" so i blame the manga for my troubles XD but looking back she is pretty feminine, especially in brawl XD