I'm not a rabid Frazetta fan who cherishes every last skoodle (sketchy doodle) that he does, and in fact much of his stuff leaves me cold. But his Edgar Rice Burroughs stuff is some of the best illustration in the world, and his Howard stuff is good. The Egyptian Queen in its incarnations below is my favorite non Burroughs/Howard painting of Frazetta's.
The Warren cover, above, was later reworked by Frazetta to its state shown below. That version is the signed limited print that hangs in my studio, inspiring me to be a better artist.