Drawing is a way of bringing out the creativity in you. One can express a lot through their drawings. In such a case, one must feel free to draw what they want. Professional artists may have restrictions if they want to fit into a certain group or sell something specific.
However, everyone should draw as they wish. This brings out their inner feelings and leaves the person calm and relaxed. This is because drawing is a form of therapy that helps you deal with stress and other issues which may need professional help.
When you are drawing, you let your inner emotions and feelings control your mind and come out in form of some patterns and designs.