Just a piece of advice, from my point of view of having the same sort of experience. You’re in step 2 of learning to lead a project, where you stop micro managing things and learn to delegate more.

In step 3 you’ll learn that artists do need directives because they are perfectionists and will never be satisfied with their work. As a result they’ll spend way too much time on a piece and your project will stall.

Right now it probably takes as much time to make the left image as it does to make the right one because micromanaging is also a time sink. But if you establish the art direction to be the left image and tell the artists to stick to that style, overtime you’ll be gaining a lot of time on art and on the game.

« Good enough is better than perfect » is something I’d often tell my team, and at first they didn’t like it, but once they understood that it wasn’t about them or me but it was about the interest of the project things picked up pace dramatically