This workflow uses a rotated latent between the first and second samplers.

The image starts off with a vertical aspect ratio and is swapped to a horizontal aspect ratio after the first sampler. swap_dimensions is set to On in CR Aspect Ratio.

Random color gradients are created using CR Random RGB Gradient and Image Generate Gradient.

Img2Img latent noise is introduced via Img2Img using a random color gradient.
Recommended models for this art style:

• AnimeGodXL
• DreamshaperXL

No LoRA are used.

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Prompt:

posterise, line-art, manga landscape, roger dean fantasy