Hey man,

I wouldn't worry too much about "negative comments", but don't forget to tease (readup on push/pull)...if she says something dumb then call her on it and have a laugh...they love that...some of the best reactions I've had off girls was when I was taking the piss out of them (nicely).

Having said that, I did just think of a variation on a common theme the other day, "your hair is really nice like that....did you do it yourself, or...?". I've not used it.