This one works, but takes some practice to nail it:
Just go up and just tell them how they would look EVEN BETTER to you. "Wear your hair open", "open that up one more button", or just fix their clothes. tell her what would look amazing on her.
Train your eye to look for imperfections and what to do against them. For the clueless, get two-dozen model magazines and look through the pictures SEVERAL times so you get some idea. Try to make up negs for these girls and point out what would look better on them.
This sets an interesting frame. first of all, you are teaching her how to please you, if she reacts well, praise her for being a good puppy. Second, it is obvious that you are the prize, that you have standards and that you know what you want.
Women love the idea of seducing you, you just gotta teach them HOW and they will comply.
This is NOT delivered playful or c&f or anything, just a genuine comment.
From there, it's easy to launch right into a routine (for example you can talk about what and how much clothes say about people and cold-read her right there. whatever you want.)
I actually jump right into the cube after this one usually.