Hello guys !
HOW TO FIX: If you do this mistake as well, you have to double check your chair and table height. Your shoulder should be relax when you draw. Remember that to draw straight lines, you have to move your whole arm.
It’s a very simple thing that unfortunately affect a lot of beginners who are not aware of the importance of body posture. You can learn more about the correct sketching body posture at this article. If you wanna go further and starting sketching with the right habits, I invite you to receive the Designer Starter Kit.