Eames' face goes through a weird series of expressions when he sees Nancy, surprise and a little annoyance being the main two. Not directed at her, which should hopefully be evident from the way he glances around the crowds after she speaks to him. But if he's here that means Fagin's around and he only has so much false civility stored up for the night.

Wherever the miserable bastard is, he's not in the immediate area, so Eames focuses on Nancy. Giving an appreciating look over her outfit, "well don't you look radiant?"