Newton published a number of comics with covers produced in-house, especially in their second phase of one-off titles. Typically these covers were collages of images cobbled from interior images, although there were exceptions whereby the images were culled from other sources.
Giant-Man Doctor Strange 100 Page Mammoth Marvel Masterpiece reprints a number of Giant-Man and Doctor Strange features, but oddly enough does not feature Doctor Strange on the cover:
The various images are sourced from interior contents as per below:
The other thing that stands out on these in-house collages is the colouring. You'd swear they were done with textas! Utterly charming, of course - nowhere near as stomach churning as their bone fide printing errors.