Men, What's The First Thing You Look At When A Woman Approaches You

To see if I can see her  nipples protruding through her shirt.

If it's angry, I then scan for any sort of weapon she may have, LOL.

But seriously, a woman's posture/how she moves means a lot to me. A relaxed confidence that she knows she's the hottest girl in the place, but also can be a guy's best wingman. That's sexy.

I am in civilian mode, or whore-mongering pig mode.  In civilian mode, I will always look at her eyes and hope her eyes catch mine.  If she smiles back at me, I may say something funny to make her laugh and see if she stops to converse, then play it by ear from there.  I try to be charming and professional in my civvie life.  

 
On the other hand, if I am coming from a session or thinking about next one, as a woman approaches, I will often glance at her crotch to see if there is any physical evidence of whether she shaves or not.  If the pants are form-fitting, there is often a visual clue which  way the question is answered.  Other times, you can't tell either way.  Shaving is di rigueur for us DATY connoisseurs.

... is her hair, but the first thing I look at is her face if she's coming towards me.

But in .00157 seconds later, I look at everything else! :P

The first time our eyes met, it was fantastic.  My heart skipped a couple of beats.  
Then getting lost deep in them was Heaven as we fell together.
Yeah, it's the eyes that get to me.  

First off... HI ASHLEY!  Haven't seen you on here for a while!!

On to your questions -  

Always the face first, and expression.. then the eyes.  And of course the shape.  I'm a hip guy.  

First you have to breathe it all in! What’s the first impression? Hair, height, weight, dress, style, make-up, smell! Ok now worth a second look! Yesterday I saw a beauty in a short dress with legs that never ended! Tall, slender slightly muscular! A few days ago, it was a well-dressed business woman with a sheer top - imagining what’s underneath!  Before that, a recent provider with sexy tats visible around her tight tee! Can’t wait to take that off! You show me the way, I follow!

Hips.

J. Giels sang it years ago.  He meant, does she have money, but I mean to use that line to say, "I check my wallet to see if I have enough cash on hand to swing a session, or do I have to go to the ATM...."