Anything shorter than shoulder length hair, would make me look like a boy. I think it depends on your nose & whether or not you have a curvy figure to pull off a pixie cut.
Mine is a shortish pixie. I don't use a brush or comb but just use a small body massage brush with rubber round spikes in a circular motion every day. Then just smooth it. Lots of movement and shapes to head. Fluffs up the volume too!