Number of images? 2

Before and after images required? YES

Screenshots of images open in Photoshop or Photopea with layers showing? YES

Mr. Lindroth’s Sample Album

Photoshop Video Tutorial

Fill A Photo With More Photos Photoshop Essentials Tutorial

Here is a variation to increase contrast and view of main face:

Here is an explanation of this technique here:

Variation for Fill a Photo with Photos Pattern

Cannot do this technique with Free Version of Photopea