Criticism and compliments when offered in a measured and balanced manner do wonders. Yes, criticism when balanced is called constructive criticism. Whenever we are criticizing someone we shouldn’t be doing with a vested interest. Criticism with vested interest is not criticism, it is enmity. A high degree of positivity and an intent to nurture and grow the person being critiqued works wonderfully.
When reviewing work of our kids, our criticism, if gentle enough, is a big motivator. Positive criticism is the fuel for urge to win and desire to do better. While on the one hand, it is our duty to do constructive criticism, on the other hand we need to teach our kids to not take criticism personally. Definitively, the idea is not to break them but to make them understand, learn and make it better.