I Airbrush and am the same ocd about my art. If it’s not right it keeps getting re done until I either run out of time or attempts to improve it start making it look worse
Motivation is the key to getting it done quickly, which for me is usually money lol. Try giving yourself a deadline.
I always struggle through the first half of a picture, as it doesn’t start to look good until I get the detail work in. I have a thread here if you want to check out some of my stuff, I do a work through follow along from start to finish of pictures.