I finished work on "Sarrina" who is the primary antagonist and villain in Canthos Adventures. It's a she! and believe it or not, the first woman i've ever drawn from pure imagination (I drew part of trinity once for my part in the Matrix has you again, but i was closely basing it off of a figurine i had a picture of, so it doesn't count)
I think it came out pretty well, a few people say she's a bit butch, but I had intended that as she's supposed to be like queen bitch supreme bounty hunter chick who hates all men.
Psychofig
I know you said it's supposed to look butch, but... I really think it should be toned a bit. I like the art though. Make the eyes softer and have less thick of eyelashes. Most femenine game characters have eyes that are really nice, which makes them memorable.