Pick your TOP 2 portraits. You are going to prep them for the tutorial.
Find full tutorial HERE

1. fix large blemishes
2. crop excess space
3. Add brightness/contrast
4. quick select the background and CTRL+SHIFT+I to invert your selection (so the person is selected)\
5. Click "refine edge" in your toolbar
6. Increase the "radius" slider until you have grabbed any stray hairs or details. Play with your other sliders so make your selection perfect.
7. In the "output" section of that menu, click "New layer with layer mask". Click ok.
8. This should have made what we call a "clipping mask" or a new layer mask clipped to your selection
9. Create a new layer. Place it underneath your portrait.
10. Use paint bucket to fill your new layer with a neutral gray. Do this by double clicking your main color swatch until you get the color picker menu. See where it has a # sign on the bottom. Enter this #dcdbd9

11.  Choose your second photo of a natural scene or texture
12. Put that image above your portrait
13. Hold control and click the LAYER MASK of the portrait (not the actual picture). That should make a selection in the shape of the man.
14. Click the "add layer mask" button (down there by Fx button. Looks like a square with a circle in it)
15. If you click the tiny chain link between the image thumbnail and mask, it will allow you to move the nature layer around for the best fit. You could also flip or rotate the nature layer to fit well with your portrait.\

16. CTRL J your portrait layer to make a second one.
17. Place it above the nature layer, so you should have a portrait layer, a nature layer, and another portrait layer.
18. For an interesting effect, desaturate the portrait and nature layers and "colorize" them using the hue & saturation menu
19. Open levels. Make the top portrait much darker.
20. Right-click on the portrait layer mask and we can Apply Layer Mask in the dropdown menu. Change the Blending Mode of the portrait layer to Screen in the Layers panel.

21. Now it is a matter of blending the two images together. If you select the MASK on the nature layer (the black and white attachment) you can use a soft, low opacity brush to blend the two. Wherever you paint BLACK, the person will show. When you paint WHITE, the nature will show.