Step 2: Bloody Face Insert - with Curves & Colors
Now open up the graphic of the piece of meat - just go to File, Open and locate it. Return to your graphic of the chunk of skin and go to the Layers pallet, then locate the layer of the skin you cut out, Right click over the layer and hit SELECT PIXELS. Then return to the image of the meat. Duplicate the meat layer - then go to SELECT, ALL and COPY. Then return back to your graphic of the chunk of skin and go to EDIT, PASTE SPECIAL, PASTE INTO... and you'll see the big red slab of meat in place of that part of your face.
Change the meat layer settings in the Layers area - see graphic to know the settings I used. This is up to you - plus or minus in the opacity and fill area. Then on the Layers pallet, right click on the chunk of skin layer, hit Select Pixels. Then go to Layer, New Adjustment Layer & Color Balance. Change settings like the image below or adjust according to how you like it - you can easily change it more later.
Right afterwards, click back onto the chunk of skin layer and be sure the pixels are selected, then go back to Layer, New Adjustment Layer, Curves. Check the Layers pallet and move this layer above the Color Balance layer and above the skin chunk layer - so it will be Curves layer, Color Balance layer and Skin chunk layer. Then go back to the curves layer and adjust accordingly. If you move it certain ways it will make the skin look more raw, a bit glossier with almost the look of fatty chunks to it. It's disgusting - but works!
If you noticed, my image is showing me working on this already on my main image but I recommended that you work on a separate layer to create this. One done, you could flatten your graphic and select it, Copy it and return to your main image. Your main image will already have that area you selected earlier, selected - so then go to EDIT, PASTE SPECIAL, Paste into and it will go right into place!