Here's one artists concepts of the creatures created by Lovecraft and other writes of Mythos stories. Please be aware that some of then can be thought of as NSFW!!Yog-Blogsoth
"...but, oh God, the face! A skull to which no vestige of flesh seemed to remain but on which taut brownish-yellow skin grew fast, etching out every detail of that terrible death's head.
Skull Face, by Robert E. Howard