in person, their eyes

online, their sense of humor, or their depth, depending on what they write.

if they look me in the eye with a real greeting ,how they react to seeing/meeting me

How they're carrying themselves.

Eye contact, or lack of.

How attractive they are, which is the answer that most people would give if they were being honest with themselves.

Whether there vertical or not.

I have been raised to be aware of people around me, the first thing I look for is if they look dodgy or not.

Their eyes, lips and hair- always in that order.

Snapchat filter.

Their scent. And overall appearance.

Sorry the warmth ( or lack of) in their smile

I notice whether or not they look me in the eye. Most people really don't, they kind of glance and look away.