It is not a very complex or difficult workflow.
I am publishing this workflow to answer questions like "your image has a lot of detail, how did you do it", "can you share a workflow?".
Of course, it works well on other models, but I would like you to use my FRT models and give feedback if possible.
This workflow is in order:
Image generation with Lightning model,
Upscale with SD1.5,
there are also elaboration and correction processes with SD1.5.
SD1.5: https://civitai.com/models/286334/frt-mixmodel
Lightning: https://civitai.com/models/433850/frt-mixmodel-sdxl