Tattoos and teaching

May have been talked about but I’m a teacher and I have tattoos. I cover them so my students and admin never see them. I doubt they know I have any BUT I’m on Facebook and I have a lot of co workers and parents on my list. I’m very careful to not share anything deemed inappropriate, however I have great photos of myself with my tattoos being visible (it’s on my upper arm). Could I get in trouble for that? Working for a private school? If a parent or co worker saw and told admin. It’s not inappropriate. It’s beautiful and it’s a shame I cannot share it on my own personal FB which is private btw.