Is it gay to have large posters of models or girls?

I wanted to get posters for my room and i stumbled across this large one advertisement for a clothing brand store with a girl model . Is it gay? Im a girl. I can't put up guy posters just because my mom would detest it. But I also think it looks pretty. I thought it was pretty but then Im afraid people may get the wrong impression . should I get rid of it. its like a six foot poster.