As requested by the one and only Rune, this is a LoRA of the famous actor Nathan Fillion.
The style is meant to be close to realism but slightly different so as to contain some semblance of the "celebrity filter" Stability AI has placed in their original SDXL 1.0 model so as to protect the likeness of people from being used to portray them in a manner that they do not endorse.
Still, it is on the base model and produces fairly good to exact likenesses so please feel free to use more prompts or to have a good base model for realism and see if you can get the photo quality you may seek, which this should come close to.