“You fear mistakes, but you shouldn't.
Mistakes are your best friends as an artist. Embrace them. Seek them out. Draw with the purpose of making mistakes. When I was in one of those progressive European art schools when I was a young lad, all the teachers did was setting you up to make mistakes. Because with mistakes comes discovery. At one point you develop a system that is based on making mistakes. It's called experimenting.
You produce 100 mistakes and you get 1 gem. You have now truly advanced, because you progressed with awareness.
On a smaller scale.
There is a shitty line in your drawing. Great. Pay more attention to it in your next drawing. Or schedule in some line practice.
Ignore perfection. You want mistakes. Mistakes are what you should go for. Mistakes are your best friends. They don't lie to you and tell you what you need to know. Cherish them. Look at them for what they are. They are you. And you need them. Every time you make a mistake and you see it, you should be happy. Start looking for mistakes. Make them on purpose. Train yourself. Practice making mistakes till you are comfortable with them.
Nothing comes for free, except the gift of mistakes.”