Hi and welcome, I'm fairly new as well. For me, the first turn off is when people's bio start with their full name followed with "has been painting for blah blah blah.., as though they are world reknown, it comes off as being stuck up, unapproachable, and stuffy. I say 1st person, not 3rd! Be friendly and be real. Just write a few sentences describing what you paint, how you got into it, and maybe what your intent is behind you art. Also, nothing too lengthy... ;)