One trick is to use an LLM to describe the art style of someone and write a prompt based on that. It only works if the LLM knows who the artist is, obviously. “[Name] style art” also works most times.
All true. I was learning to get to grips with prompts and AIs in general and I used tips offered by various blogs and websites on-and-off. Found that much depended on which AI is used for what. Some had "categories" that sort of committed the AI to a certain style, subject, or both. So sometimes I could get the look I wanted by running a prompt through various categories and then seeing what was what.
Weirdly, that could even lead to the things generating brilliant brambles in one category but that I then had to use another category to get them with fruits on.
Ultimately, like you say, I found that AIs are not omniscient and that they have been trained for specific purposes - which severely limits their use at least for many of my purposes.
For example, I have tried literally
many times to get Neural.Love and SeaArt to start drawing things in the Franco-Belgian comic style. As part of the process, I decided that generating images of city streets would be the way to go at some point and that led me to trying to make them draw a pale blue Renault 4. In all of two weeks of almost continuous trying (and then some), they didn't even come close and I was stupefied how they just wouldn't learn how to.
So that's when I found out that machines learning to do things doesn't always comply with how I think they are learning things, if at all - and
what they are learning, exactly. Which is actually quite an interesting subject, for how can we get machines to understand the gist of what we're saying to them in different and changing circumstances? No tones of voice, no facial expressions, no eye movements, no moving of hands, no environmental conditions - the only things they can work with are the words you feed them and then their databases to calculate probabilities. Made me think a lot about language and how we use it.
But I digress and things may have improved since I last tried working with AIs - and will probably work better if you have your own, local AI?