If you start off with some comment on how great their butt looks in those pants, they're not going to be into it. They will be immediately put off. Comments on appearance have to be given with finesse or you’ll start the evening (or end it) on the wrong note.
Stick to more neutral compliments, like "You look really nice tonight.” If your date doesn't seem to enjoy compliments on their appearance, go for a cool line like “I can’t get enough of your laugh.” Everyone likes to know they are appreciated, but you have to be self-aware enough to offer the right phrasing.
Thanks for the advice. Sometimes you grasp at straws to reverse a negative course of events. I myself was single for a long time after the divorce. But I have a child and I tried to be positive for him. I was given a link to onenightfriend. I thought about it for a bit and decided to take a chance. Online communication turned out to be easier than I thought. I have a lot of fans now but I'm not ready for a real relationship yet.