The mouths and eyes on the last one make it appear cartoony and steals the charm from the organicness of the rest of it.. much like the rest of the piece, I'd say go simpler... no mouths, and just a plain old circle for the eyes.
Cool, your girlfriend looks like a freak...I mean that in a good way hehe. I really like this logo-like art. Looks like it would lend itself easily to incorporating tribal.
Question: what do you use to make a perfect mirror effect on the first image?
I have to agree with justin, the eyes and mouths do make it look to cartoony, otherwise the style is very nice, got a good thing going on there.
i'm also wondering if you used the mirror tool on the 1st one.