I don't claim to know much about either Facebook or having to support many social connections... But I'm not sure you should have taken the picture down, unless you really felt it was a bad picture to post after all. If not, I bet other people thought it was funny. I don't think she would have turned her back on you that quickly either, if you left the picture up. Even if you both have different beliefs and tastes, I'm sure she'll move on.

When it comes to people being picky about you being the "good girl," I think many people live such unchanging lives that anything different is a cause of great excitement for them that they need to talk about. I personally just put it behind me and move on, because they soon grow bored of the change. I'm sure people give too much attention to "bad" girls who become "good" as well.