Hi there! Im not a professional artist but I am good at critiquing art so yeah I thought this lovely picture would be fun to do. First off you did a great job getting all the right colors for korra. From her skin to her hair everything matches. However, the shading is a little rough and I think a colorless blender or a light shade that you started off with could be used to fix that. Also some of the pencil lines could be erased after words to give it a really clean look. The picture over all is great though :3