I need a lot of help blending my cyberfaces!

Could anybody please help me with blending the skin on my cyberfaces

its a serious pain in the ass. there are lots of methods, but i use adobe photoshop image/color levels to tweak the face you want to add so that it matches the face you're pasting onto. you gotta make sure the eyes, nose and mouth match. once i get the size and color right i use the blur and smudge tools to blend the edges. i suggest a heaping helping of trial and error.