That has to be some really strange context, because regardless of whether it's a bet or an artpiece, you still drew the picture. Apart from her asking you to draw exactly that, I can't come up with many excuses. Anyways, in your place, I'd remove the pic and replace it with something funny.
Klin: I don't know what made you think it was alright to post that, "bet" or no. I don't want to hear any more about this, as you know it is not right and any idiot can see that.