As many before have said, context is important. I would never ever compliment a woman on her breasts, ass, figure unless I was already in a relationship with her. A more general comment like "You look nice in that dress" or "I like your hairstyle" might be OK with women I know well (friends, relatives, co-workers), but I don't think I've ever said even that to a complete stranger, as it seem creepy to me.
There are only a few occasions where I would complement a woman on something as specific as breasts, ass, etc. One is the woman I'm involved with, and two is those type of pictures posted here on LPSG. If you post a picture of your boobs, and I like them, I just might complement you on them!
As for me, I'm not a troll, but not Brad Pitt/George Clooney either. On rare occasions I do get complemented by somebody other than my wife, and I've now grown more accustomed to saying 'thanks' instead of trying to brush it off. My wife complements me quite often, and I now accept them graciously.