1. First, open two pictures at the same time in the PS edit box, as shown in the figure below, one is large and the other is small.

2. Click "Move Tool" in the left toolbar, as shown in the figure below.

3. Then use the mouse to hold down the picture of the boy on the right and drag it to the big picture next door. You can see that the picture of the boy is still getting bigger.

4. Then press CTRL+T, and then adjust the size and position of the boys' pictures to keep them smaller.

5. Click on the file in the upper left corner, and a selection box will pop up automatically. Click Save As to save the photo.