This is your last drawing step and all you will do here is first draw out the detailing on all four Slipknot masks as seen here. Now every member has their own look and as you can see they all resemble a horror movie character. Pinhead, Jason, Leatherface, and Mike Myers. Once their masks are sketched out you will start detailing their clothes by adding wrinkle and crease lines. Give the member in the front a mic and start erasing all the guidelines and shapes that you drew in step one.