I'm absolutely blown away by this model, so here is a small workflow. Simple 3-Sampler to get a bit more variety out of this model and then a 2x upscale. The resulting images are absolutely incredible.

The CG-Image Filter node is optional and can be removed. I use it with a batch size of 4 on a RTX 3090 to generate multiple initial images and then filter out the one I like to upscale.

If you generate digital illustrations / drawings, change the prompt in the "Upscale 2x" node.

Custom Nodes:

RGThree: https://github.com/rgthree/rgthree-comfy

UltimateUpscaler: https://github.com/ssitu/ComfyUI_UltimateSDUpscale

CG-Image Filter: https://github.com/chrisgoringe/cg-image-filter

Custom Models:

Real ESRGAN 2x Plus: https://openmodeldb.info/models/2x-realesrgan-x2plus