1. Perfectionism: It doesn't have to be perfect, it's still good.
2. Art block: Ugh, everybody hates art block... If you're bored, you can make fanart of your favourite character or practice drawing something you struggle with.
3. Self-doubt: Please, oh, please! Don't let this get you! Don't lose hope!
4. Impatience: Just be patient! You won't just wake up one day and start improving! Improvement takes time!
5. Sensitivity: Don't be sensitive with critique (unless it sounds hurtful or destroys your art style). Block hate, and take in critique!
6. Terrible posture: Everyone has this sin. Even me, all professionals. It can result in a painful backache.
7. Lack of practice: Okay, I admit, I do have this sin. I should practice drawing things I struggle with more. And YOU should do that too.
Don't let these get you!