he is doing a tattoo for me
he seems impressed that i drew and designed my whole back piece!
So you have something in common and a topic of converstation.
without being obvious
I would just ask. You are going to chat while he is doing your tattoo, so I think it would be a normal to ask certain questions which will let you know if he is taken or not.
last session my male friend was with me too
He may have assumed he was your boyfriend.
he may even not like blondes
dont think you should worry about that.
Totally getting ahead of myself
relax, have fun and be yourself....nothing to lose :) go for it!!!