For best outputs:

Sampler: Euler a

Steps: 25, cfg 7, CLIP skip 2.

VAE: kl-f8-anime2_fp16.safetensors

Pos prompt: you can keep it simple and there is usually no need of big weights, for example, "masterpiece, best quality, 1girl, cowboy shot, (glowing effect), starry sky, star trail sky, colorful, fantasy, glowing petals".

Neg prompt: this is the one i used in my example runs: "(worst quality, low quality:1.4), bad anatomy, disfigured, interlocked fingers, loli, child, kid, underage".