Adopt criticism adequately
We are judged and criticized constantly. But we need to see it from the proper perspective. Criticism is by far the best way to help you go ahead and learn. So, if the teacher criticizes you for some of your drawings’ or paintings’ fault, do not get angry and do not get discouraged. We understand that it’s so easy to get discouraged but criticism only shows you that there are difficulties to conquer, further things to learn in order for you to be able to learn even more.
There are many ways of handling criticism but choose to handle it the correct way. And if the critique comes from someone who definitely does not draw better than you, then simply disregard it. However if the critique comes from your teacher or from someone who draws or paints for a longer time learn from it, try to correct your mistakes and ask their opinion for them to see that you do make the efforts to improve.