Many young artist will have recognizable troubles with the way there lines and shading appear. In other words, the shading may seem inconsistent, and the couture lines seem predictable and flat. Do not be discouraged if this is you! It will take time, but eventually you will be able to hide those weaknesses and turn them into strengths! I think that learning to art scribble will help develop control and make the harder things easier. I have put an exercise together to help. Practice this once a week, and you will see results throughout your drawings.