Here is my first attempt to make an illustrious realistic model.

it use my mklan-Illustrious model as main which is merge with :

https://civitai.com/models/1257570?modelVersionId=1488590

https://civitai.com/models/958009?modelVersionId=1517097

and one other that I can't find here.

the result is quite pleasant and do depends on your settings, so check my samples or try your settings.