How to overcome the fear of imperfection?
There's a famous story about a ceramics professor who separated his class into two groups of students. The students in Group A were graded solely on a single pot they presented at the end of the semester, whereas the students in Group B were graded on how many pots they produced during the semester: quality vs. quantity.

During the course of the semester, the Group A students were agonizing over perfecting the minutest details of their pot, while Group B was furiously churning out pots left and right.

At the end, the professor examined everyone's pots, and Group B had higher quality work - even though they were only being graded on quantity! The Group A students, though they had been trying to achieve high quality, simply did not have the same amount of experience.

The moral of the story is, practice makes perfect.

The solution to your "artist's block" is not unlike writer's block. You can find prompts and assignments to force yourself to do something until inspiration strikes again. Most of all, you must accept that your early drafts will suck, and make them anyways.

I've found it very inspirational looking at re-makes or progression pictures from artists, to see how their technique and style have evolved over the years. To me, it underscores that making art is a learned skill, not some innate talent that you either have or don't have. Sadly too many people believe this, and simply give up on art because their skills are still grade school level and they haven't grown them since. But if you put in the work you will get better and better.