I wrote about Everett here and here. The Kelly Collection holds an important Everett: a link is here. Armand Cabrera provides some biographical information here.
Cabrera's post is illustrated using examples mostly from an early phase of his career, before he developed his mature style. It is Everett's mature illustrations that astonish me. Fortunately, there are at least two examples of his work that seem to be unfinished because of their appearance and the lack of a signature. They therefore provide interesting clues as to how Everett went about building up his classic images.
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UPDATE (9 January 2016):
I'm wondering if the three illustrations immediately above were all part of the same project that got canceled. The subjects and color schemes are related. The illustration that seems finished has not been signed (unless a signature got cropped). Does any reader know exactly what we have here?