Concept artist do this to some extent when they try to design things like characters, buildings, weapons and many other things. This is something that is used in some ways, in concept art, it’s called iteration, and helps to produce a lot of ideas fast.

You can apply this method to any style, since the principle is the same everywhere. This is a simplified example, but you can imagine the machine with more parts to include the tear ducts, the folds, their proportion in relation to the head, and many other things, how much detail you put into it depends on you.

You can think of it like a machine that mixes every part of the eyes. If you have a very clear image of what you would like your style to have, it will reduce the amount of variations you will draw, if you have a very vague idea of what you want, you will see that many of the variations that you draw are extremely different from each other, and you will probably need to draw more of them until you find one that you like. Your own taste will dictate how different each variation that you draw is. Obviously, it would take a lot of time to draw every single combination possible, but chances are that you already have some things that you would like for your style. You can start with the part of the eye you like more, then you make a few variations of it, and combine them with more variations of other parts of the eye, and you keep repeating it. Let’s assume you want to create some anime eyes

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