Creating AI models is a trial and error process, is looking for something or someone you want the model to "understand"/"learn" and collecting a good bundle of HQ images to train on those keywords.
I wanted to share a not so successful test in bringing Sofia Vergara to the Illustrious model. Since Illustrious is trained on anime characters, feeding a real life character is going to create anatomy mismatches, you can get some lucky good enough results but most of the model won't be useful.
For that you need a small army of artists to first toonify the model you want to bring so the learning is hybrid on both realistic and anime features of the selected character.
Not sure if anyone is in this journey, but thought it would be interesting to share some of the works behind the scenes.
Unfortunately this one is going to the shelf - One real image for comparison.