Mermaids Purse

Do boobies count as mature content? I'm going to put it up normally, but if anyone has an issue, please tell me. Funny thing is, I took my sketchbook in to the current highschool art teacher (which has changed since I left), and she was flipping through it. When she got to this picture she closed it and said "I'm sorry, we don't allow boobies here." and I was like... uhhhm ok. o.o

Anyway, I have new art now! I did this on the train ride, and I was surprised I could color it with how bumpy it was.