I wondered the same thing when I first started posting, and I've got some 3's and 4's out there... and I was like, "Sheesh, they're not
that bad, are they? I don't think the votes are always specifically to rate your boobs (which, I'd give 'em a 10!)... A lot of times they're rating the overall picture. I started comparing my pictures to everyone that was at least a 7 or over, and I noticed a few things. First of all, of course, everyone's got their own taste. That's obvious. Whether they look great or not, if a guy prefers a C cup, they're gonna rate that higher than a B or a D cup. The other thing is that guys are very visual creatures (whoa, newsflash there, lol). The pictures that show *more* than just boobs (i.e. face, hips, ass, etc) seem to rate higher. A lot of comments I see of some first-timers that post a close-up of their boobs say, "Nice, let's see the rest of you." Now, I tend to shy away from those kinds of shots because I don't have a solid, tight body like, say Hott1976 (hope you don't mind me using you as an example, but your body IS awesome, lol). I'd say a picture of her, that shows everything between her shoulders and her hips, is always gonna rate much higher than a closeup pic of just her boobs.
So, yeah, like everyone's already said... just pay more attention to the comments... and in here, where you know everyone loves to look at you.

Because of they way those scores go, the novelty of posting for ratings has gradually worn off for me, too. Just my 2 cents, lol.