Seed

Seed is the number used to generate the initial noise of your image. So if all the settings are the same and you use the same seed, you should be getting the same result. If you just change one variable, you should still be able to get comparable results.

For example, these are from my Artist study:

Both of these have identical setting the only thing changed was the prompt. In the first image you only have the raw name of the Artist so the change between the two images is huge. In the second image (woman wearing a sweater, in the style of <Artist Name>) we do get two different images yes, but the direction they look towards is similar, also the pose.

So if you find an image that has a composition you like, it might be worthwhile to write down the seed and use it, instead of a random seed.

Works well: Changing part of the prompt, adding steps (non-ancestral sampler).

Works ok: Changing sampler to another of same type, minor change to CFG (7 -> 5 or 9).

Does not work: Changing resultion with same seed.

I have also noticed that the Seed can affect the color composition you get, so if it gives you colors you like, save the seed!