Result of my experiments described in this article.

Usage

Scheduler/Sampler: Euler A + Beta

Steps: 30

Positive prompt: No need for Quality Tags, "Flatline, Flat vector illustration, Black outline, Vivid colors" can be added for a more flat result.

Negative prompt: IllusN3g

Be warned: this checkpoint has been messed up a bit too far and following prompts is not his Forte. But it will generate fun and unexpected results :D

If you prefer using a LoRA, check CuteIXL Style