Generate a photorealistic 4x4 grid collage of 16 photos total. The scene is a couple in their twenties photographing each other and taking selfies with a retro point-and-shoot camera, like clumsy yet intimate travel memories. Each cell is a different moment: camera shake, slight blur, tilted framing, flash, film grain, warm retro filter, slight light leaks, natural expressions. The whole thing looks like a real old photo album contact sheet.