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Well, you're starting with a cartoon image and you want to bring professionalism... that's like wanting to stay on a diet and eat a coconut cream pie. :)
I like the juxtaposition you're going for - nothing speaks to folks like someone with something significant to say who can still laugh at themselves, and I feel that's what you're doing.
The cartoon might have a bit too much "fun" associated with it to professionalize things up. What about a line drawing of her or single color with mult values... then a more sophisticated font might find the right balance.
Keep trying - you'll get there.
