Final effect:
Heart-shaped puzzle material:
1. Open a baby photo and heart-shaped puzzle
2. Change the index into a layer (click Image-Mode-RBG Color)
3. Drag the photo layer into the heart-shaped layer
4. Place the photo below the heart layer
5. Press the Ctrl key and click on the heart-shaped layer panel. A selection will appear. Shift+Ctrl+I to invert the selection. Then click on the photo layer and press Delete to delete it.
6. Use the magic wand to click on a small area, as shown in Figure 1, then click on the photo layer to copy
7. Follow step 6 to copy each small piece, and stroke each small piece with a value of 1 and a color of white.