It's not the face that alerts me to a hungry cat. It's the miaow!
(I don't call her 'Noisy' for nothing!)
I've not seen her since yesterday but she'll probably turn up at 4am, demanding food. Somewhat annoyingly (although it will be nice to see her again) that will be despite the large bowl of fresh food in the living room that she'll have to walk past in order to come upstairs and wake me up. She likes me to come downstairs with her, before she'll eat her food!