This is my workflow for creating realistic SDXL images using Big Lust or any other model.
The 1st pass utilizes latent upscaling
The 2nd pass utilizes noise injection to inject some noise using a detail sampler node.
The 3rd and final pass runs the image through face and eye detailing

This workflow comes pre loaded with my RunPod template
https://civarchive.com/articles/11447/runpod-template-one-click-comfyui-with-sdxl-for-effortless-sfwnsfw-image-generation