Here's a workflow i made which provides a very good foundation for making realistic photos. It can be used for other styles as well but the last part of the workflow where it uses SD 1.5 to upscale the image might have a negative effect if you use it for anything other than hyperrealism.

Flux 1.Dev settings:
model: https://civarchive.com/models/161068?modelVersionId=979329
samples: 100
sampler: euler
scheduler: beta
denoise: 1.0
tip: start with a very very low res image. somehow this gives better, less uniform results.

Flux 1.Dev 2. node settings:
model: https://civarchive.com/models/161068?modelVersionId=979329
samples: 50
sampler: euler
scheduler: beta
denoise: 0.7
upscale by 1.5x here

SD 1.5 settings:
model: https://civarchive.com/models/4201/realistic-vision-v60-b1
sampler: dpmpp sde (dpm++ sde)
scheduler: karras
denoise: 0.4
upscale by 3x here