Ask HN: What's the best way tune an AI image model on my photos?

I'm trying to make a custom artwork for my friend, and I'd like to use images of us to get the AI to recognise images of us so I can hopefully make some ridiculous but cool art that includes our likeness.

Is it possible to get decent results with this, and if so what's the best way to do it? Is it best to use an established tool like Midjourney or fine-tine something open source?