you know, concerns like these from parents always make me think "Do they never had a childhood?" Children are always searching in this world. Everything they do, every drawings they make, and every thought they blur out might not actually have any meaning on their part; at least some of them are only reflections, expressions of their thought processes. Every child is different, it is important not to mold them the way parents want to because kids like to please, and once they start doing things just to please, they will feel prisioned sooner or later in life- because they don't want to displease you.
No one is "abnormal" in the head. He/she is just different, and that's the most wonderful thing in the world. Only the bravest, the brightest, and the most creative people are qualified to join the club. If your child continues to draw mustache on female pictures even after she passes the age-that-can-get-away-with-everything, that'll just be who she is. If I could, I'd tell all the parents in this world to have faith in your child, accept whoever they really are, and I'm sure they will be fine. I apologize if I sounded too harsh, but my life WAS quite like it. I don't want to go into it, but thank you though, for letting me express myself.