Alice has aged a bit since her original adventures in the land of Wonderland, though not nearly as much as she should have, given that she was born in the Victorian era of England. All the same, her attire remains unchanged, and if she has her way, it will remain that way regardless of the circumstances. Her facial expression is typically one of either mild amusement, or vague curiosity, and never seems to reflect any strong emotions, even if her life is in danger. Similarly, her voice is quite inexpressive, and doesn't give away a thing she's thinking.
In terms of personality, Alice has changed greatly, while still remaining the same. To clarify, she is still quite intelligent and inquisitive, but her sense of wonder has largely diminished, and it has become nearly impossible to surprise her. Spending a century and a half in a place that makes literally no sense whatsoever will do that to you. It also seems to have emotionally deadened her somewhat, as she has no real reaction to realizing that she has survived far beyond her natural lifespan, and that everyone she has ever known is dead now. Another effect that prolonged time in Wonderland has had on Alice, is that she has largely given up on logic, and tends to act something like the lands inhabitants. She also believes she is being followed by the Cheshire Cat, though this may merely be her imagination. Finally, it should be noted that she's spent the majority of her puberty in Wonderland, so naivety and odd ideas about some things are to be expected.
Alice also carries a few things on her person. The first is a deck of cards, which seem to have vaguely defined magical abilities, though this could merely be Alice using the cards to display her own power. She also seems to be able to draw a kitchen knife from somewhere on her person at will. It isn't clear where this is kept.