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. Merge them into a single highly realistic image. The grown-up version should gently lean toward and stand close to her child self, as if taking a selfie together. Keep both faces unchanged and as accurate as the original photos. The shot should be from a slightly high angle, wide-angle lens style, as if captured with a real smartphone. Use a clean white background with even soft lighting, making the atmosphere natural and candid. Ensure both the child and adult versions look directly at the camera, with a realistic sense of closeness and continuity in age progression.