Your back hurts? Are you drawing with your spine? Huh, whatever, looks good, but a background would be preferable; I know, 'Quick sketch', but still, it brings everything together so nicely. Anyway, I like the eye, like a emerald, which is my birthstone, ^_^. The ear is a little too small, a tad too high, and a bit too far back (picky picky), but thats the only anatomical (uh?) problem that I can see.