I love this entire concept! If you want to try this yourself I suggest you dye the hair orange first. Then use a spray on temporary black hair spray colour. Then make a home made cut out stencil to create the clean lines in the eye and the mouth.
“PumpkinHEAD” by Jacky-Hell-Oween
♥ See it here: http://jacky-hell-oween.deviantart.com/art/PumpkinHEAD-168754854
(via Halloween Hair Ideas)
This is clever, I like it!