For what it's worth, it's dead simple to make Roger Dean-like watercolor gatefold album covers in SD. This is because Dean's process already involved use of randomness and refining watercolor effects with additional painting, which is similar to how Stable Diffusion works. Many of the Dean tropes just pop out for you, reliably.

What I'm finding interesting is twisting that to attempt non-Dean-like prompts within the 'gatefold album cover in watercolor' concept. It's not hard to get vibey graphics telling Stable Diffusion to paint in various mediums.

I would imagine you could do very decent Pollocks in Stable Diffusion if those are represented in the database. The artist's process shares elements with how the AI makes art.