Believe it or not, but you have come to your last drawing step. Here you will sketch in the final detailing to the aliens body. Start by drawing the bone structure on the side of the head, and then sketch in the stretched tissue lines that is on the cheek. Next, draw the skin texture detailing on the underside of the chestburster, as well as along the sides. Next and lastly, add detailing or definition to the human skin tissue.Clean up your drawing to perfection and that's it.