Img2Img is probably my favourite thing to use AI art tools for, here's how I made some faces recently.
I rendered out the flat image of a model in DesignDoll and then used some painting over/adjusting in Krita to get this first basic boring grey figure.
From there it's a matter of tuning the denoising strength, cfg strength, prompting and weighting the lora styles to create all sorts of faces.
Giving it all of the creative freedom by turning up the denoise high and CFG low can yield some very weird or cool results.
So I think the sweet spot to create a unique looking character face with this kind of input is usually going to be a high denoise value and a moderate CFG value.
Keeping the denoising level low can render a facial onto that dummy face, making for a great source of simple references.
For more variety, why not turn clip skipping up from 1 to 2?
Thanks for scrolling this far; I hope you enjoyed looking at my results and got some ideas from it.
I will be posting more as I continue to learn so if you have questions or comments, feel free to get in touch.