Sounds like a fun project. Honest question: why would one switch from a much more capable "carry everywhere" smartphone camera to this? Especially since phone is truly carry always & everywhere and that computational processing squeezes out insane amount of photo quality from already excellent phone cameras.
Photos aren't only about quality, especially there days where it's popular to use lower resolution cameras, with worse optics. Specifically for portraits, it's common to use diffusion filters that reduce a bit details/contrast or do that in editing so you don't see every little "defect" on someone's skin.
Some people specifically want something other than their phones because they don't want to always have their phone or use it all the time, others want better controls or a different experience.