Well I always tell my DD she is cute and looks nice. I also tell my baby boy how pretty and beautiful he is.
But I really try to focus on healthy eating and taking care of your body for health reasons, not beauty reasons. I also put a focus on doing well in school and learning and being responsible. And just being a good person in general.
I do my best to be careful about what I say. To not put too much of an emphasis on beauty and looks. My DH and I both think the same about this.