Based on workflow from civitai,I created this text to image workflow with face detailer(Flux/illustrious),and you can compare the result before/after the face refine.

I made 3 versions for Flux dev,gguf and Illustrious checkpoints.

I tested with several checkpoints,this workflow works well with these checkpoints:

For dev version:
Edge of Reality 真实边缘 - 3.2 Beyond Reality | Flux Checkpoint | Civitai

FLUX - Dev | Flux Checkpoint | Civitai

Real Dream - Flux.1 - V1 | Flux Checkpoint | Civitai

majicFlus 麦橘超然 - v1.0 | Flux Checkpoint | Civitai

For gguf version:

Real Dream - Flux 1 V1 GGUF Q4_K_M | Flux Checkpoint | Civitai

Real Dream - Flux 1 V1 GGUF Q5_K_M | Flux Checkpoint | Civitai

For illustrious version:

Prefect illustrious XL - v2.0p | Illustrious Checkpoint | Civitai

Vauxz Merge 2.5D - 3D - ILLU v.Sarah | Illustrious Checkpoint | Civitai