The most recent version of this Neta Lumina finetune is a pretty solid improvement over the base Neta Lumina 1.0, IMO:
https://civitai.com/models/1790792?modelVersionId=2122326

Positive:
`masterpiece, best quality, 1other, rimuru tempest, dim lighting, yellow eyes, long hair, blue hair, hair between eyes, (smile:0.8), (glowing eyes:0.4), closed mouth, looking at viewer, solo, reaching towards viewer, fur trim, long sleeves, reaching, chromatic aberration, (best quality, very awa:0.8)`

Negative:
`ai generated image, blurry, worst quality, low quality, bad quality, normal quality, sketch, simple background`

Seed:
1214320592

and Euler Ancestral Linear Quadratic @ CFG 4.5 for both