I wasn't a teenager that long ago and I found your list a bit overwhelming, S E L F is really good and what it stands for but also because I think the road to recovering from any trauma is self-respect and self-esteem. I could also really see SELF in bug letters going down the door.

I would go for nice bold colours like on the picture above, hot pink and white or ruby red and baby blue, baby blue is always popular with girls, dolphins seem to be popular as well

Sound like a fantastic project and I can't wait to see pictures