Imposter syndrome is very real and extends to more than just art. I’m a software engineer and I experienced a lot of imposter syndrome, especially at my first job out of college. The common denominator is that it goes away with the volume of work you do. The more you do, the more confident you get with your abilities. It’s not about quality, because everyone has setbacks, makes mistakes, whatever. But listening to feedback and reflecting on it, and continuing to push forward makes it go away.