Ha, I do it constantly. I know what she wears, how she fixes her hair depending on the weather, how she does her nails (feet too!). I know by looking into her eyes whether she's cognitively engaged with me, empathically attuned, or processing a thought. I know she has a chronic discomfort in her right shoulder/neck (she unconsciously rubs it now and then). I can tell when she's tired, has had a long day, is feeling good, or has an "attunement hangover" carrying over from her previous session.
I am obviously obsessed, hee.

But she practices a kind of deep attachment/empathic therapy, so that level of connection is expected, and I often feel like a child memorizing her mother's face as we talk. It's kinda creepy when I look at it through my cynic's lens, but it has been fantastically healing. (and she smells amazing.

)
Perhaps TMI, lol. I'll see myself out.