I think it might be against Gaia's rules to just use any pictures from google or whatever without the owner of the photo's explicit permission. That may only apply to when they're being used in graphics, I'm not sure...
I myself don't Roleplay, but I'd personally advise getting such pictures from a website that offers a variety of free stock photos that are specifically anime themed.
Some examples:
Pure Anime Gallery FerriCorpAnime PaperAnime OnlineAethereality Gallery (this seems to have some particularly nice & "artful" ones)
etc.