based from meina, If you want the art to be more realistic,

add: ' photorealistic, (hyperrealistic:1.2) ' in the prompt.

- Sampling method: Euler a, 24 steps.

- Resolution: 512x768, 768x512.

- The VAE is baked-in.

- Negative prompt: ' (worst quality, low quality:1.4), monochrome, zombie, extra limbs, '

If you can use upscaler to improve some details like the eyes:

Upscaler: ESRGAN_4x at 10 steps and 0,3 Denoising in 2x.