the erazer tool is a verry powerfull tool when it comes to face replacement. now, after tracing the "new face" around with the pen tool hold the controll key and press entre (Ctr+Enter) then copy and paste then set it as u will, you will now pick your erazer tool and reduce the steght and ...

can i see the picture ur talking about ?

go to the layer pallate @ the right conner of the frame clik on (italic "F" icon), then sellect outer glow


i' attached it along

check the property bar(onder the menu bar @ the top left corner) afther u select the marquee tool change the feather to : (0% px ).........