I made the template in Fusion360 because I wanted the dimensions to be perfect and I couldn't figure out how to do that in GIMP. I then brought that template into GIMP to create the mask. The input photos were all AI generated as well. The only thing not AI generated or made myself was the generic background image which I found on an image search. I will include the generated images and the mask and template I created in the post if anyone wants it.
I used this lora to get the yearbook style.
https://civitai.com/models/153899/yearbook-style-photos-lora
The models I used to generate the input photos are linked below.
Dark Sushi Mix:
https://civitai.com/models/24779/dark-sushi-mix-mix
ChilloutMix:
https://civitai.com/models/6424/chilloutmix
AAM XL (Anime Mix):
https://civitai.com/models/269232?modelVersionId=325105
Delta:
https://civitai.com/models/249918/delta
Aniverse:
https://civitai.com/models/107842?modelVersionId=275408
RealCartoon-Pixar: