For best outputs:

Sampler: DPM++ 2M.

Steps: 30, cfg 7, CLIP skip 1.

VAE: none required.

Pos prompt: start it with "realistic lighting, photo, photorealistic, cinematic still, emotional, harmonious, vignette, 4k epic detailed, shot on kodak, 35mm photo, sharp focus, high budget, cinemascope, moody, epic, gorgeous, film grain, grainy", being in fact "realistic lighting", "photo" and "photorealistic" the model's triggers.

Neg prompt: can be left blank, but using the one in my example runs does improve the overall quality a little (too long to be pasted in here tho).

Checkpoint Merge.