Hmm. Not really, but they always seem to be coded as attractive by the other RPers I'm writing with? Maybe they based off the personality, or the way people react to that person. Regarding physicality... I do know someone whose every female OC was a big-breasted, gorgeous bombshell (YES, the redundancy is deliberate) so that's his preference. 

I haven't ever used RL pics for my RPs, so when I do tend to scour for art I try to find drawings that are vague so I have room to describe my characters. (I pick a pic then build off from there until they're barely the same people lmao; though only through writing descriptions- art coloring/tampering is [b]bad[/b], people!!!)

Right now, one of my ladies has that type of picture, but for me she's average. IRL I grew up around physically subpar or average people, and I've seen how certain attitudes/quirks can make them shine so much more... So yeah, I don't place much value on attractiveness in an OC, since you can give them a presence that comes from a source other than their face or abs.