The skull itself is similiar. Just no bones behind it. And the sig will be used in dark grey forum background. ( http://www.darkness.lt/ ) I don't know maybe leave the eye sockets empty and colour the skulls bone in blue color. But then there is no idea what to do with hair. Propably hair could be done same as it is in this picture.
Also the skull should be smaller... More like an icon. Words " ... kur nubėgo? " (my nick in native language) should take most of the space.