ForumSexyPrime

Ideally, I could upload a picture or several pictures of a person's face or face/body and it would return girls that look very similar, if not, the exact same person. Pimeyes sort of does this, but it's paywall garbage. Yandex is the closest thing to this but if you upload SFW pictures to search, it will return SFW results.

You could try facecheck (.id) for faces. Sometimes it yields pretty good results for social media. And another plus is that it is free. For general reverse image search however, I think there currently isn't a better alternative than Yandex (for NSFW). Google pretty much killed their reverse image search for nsfw content due to obvious reasons and stuff like Bing and Tineye simply never worked from my experience. There is a site called imageraider but it hasn't worked for me in a while. None of these sites offer the functionality you are looking for (several pictures) besides pimeyes for faces.