These images were taken from the Original Artworks and used in the production of the comics years ago. Now the processes are mostly done on computers, so these pieces do not exist for newer comics.
I personally collect Original Comic Artwork and have done so for 40+ years. It eventually became nearly impossible to get the Silver age Covers and Splash Pages, and when you can they run into the tens and hundreds of thousands of dollars each. Please refer to pictures for more description and feel free to ask questions. The item "Original Production Art AMAZING SPIDER-MAN #28 splash page, STEVE DITKO art" is in sale since Thursday, December 14, 2017.
This item is in the category "Collectibles\Comics\Original Comic Art\Splash Pages". The seller is "colbystreetartandantiques" and is located in Whitehall, Michigan. This item can be shipped worldwide.