The best replacement for skull is cranium.

The best alternatives to skull are rated as following:
★★★★★  cranium
★★  captain america
★★  bones
★  joker
★  lady looking in the mirror
★  vanity
★  human skull
★  caucasian skull
★  female skull
★  white skull
★  coyote skull
  skull
  lady in the mirror
  lady in mirror
  dog skull
  mirror
  lady looking in mirror
  bayonet temple
  grizzly bear skull
  black mask
  crumbling skull
  goat skull
  dr doom
  neanderthal
  gary the intern
  horse skull
  hometown huck
  deaths choice
  magneto
  chimp skull
  woman in mirror
  head
  lady at vanity
  animal skull
  anthropoids skull

Your alternative for skull is not listed? Suggest!
Speaking about skull, one probably shouldn't forget about bow.

Other search terms related to skull and their ratings are:
★★★★★ bow
★★★★★ horns
★★★★ mandible
★★★ flames
★★ headdress
★★ bandana
★ brain
★ crossbones
★ pink bow
★ top hat
bow tattoo
You have in mind a companion for skull and it is not yet here? Propose!



Google Trends

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skull
cranium
captain america