This workflow uses JSPaint to sketch a input image that is used by Controlnet.
Inputs :
JSPaint image (install node : https://github.com/doomy23/ComfyUI-D00MYsNodes)
Seed
Steps
CFG
Size and batch size
Models (load whichever you want and Canny or Sketch)
Controlnet weight
Prompts
Output :
Upscaled canny image from the original in JSPaint
You can also tweak :
The KSampler settings
Do better upscaling and postprocessing
Change outputs
Don't forget to install the missing nodes and the one mentioned above for JSPaint.
This workflow can easily be used for SD15 and Flux.1-Dev as well if modified properly.