Take a photo with my childhood self

These two photos are of the same girl, one as a child and one as her grown-up self. Please merge the two photos into a single image, where the grown-up version gently places her arm around the child’s shoulder, and they stand together taking a selfie in a red space. The background should be a vivid red wall. The photo should be shot with a wide-angle lens from a low angle, looking upward, as if taken with a real smartphone. Both should be looking directly at the camera, with facial features remaining as close as possible to the original photos. The final image should look highly realistic.