I would need the support of an adobe photoshop expert to carefully add the QR code provided to the top center part of the tshirts of the people in the two AI generared images. They need to be placed in a way that it doesn't seem like an after- addition to the image.
In the image with the fewer people, we need to remove a scarf like thing on the back of the tshirt of a person in the middle row. Also on the top of the picture there are some errors in the shape of the design of the people that need to be fixed to look more as the bottom part of the picture
In the image with the more people on the top half of the image we lose the shape of people. We can fix this either by gradually fading the image from bottom to top so that the top become flu (need to see the result before I decide) or by copy pasting the people of the bottom half to add them on the top half.