Cover of Mighty Crusaders 1 (Nov, 1965)Art by Paul Reinman.

http://www.comics.org/coverview.lasso?id=19567&zoom=4

Mighty Crusaders

Full front cover as published.
Because the image is cover art, a form of product packaging, the entire image is needed to identify the product, properly convey the meaning and branding intended, and avoid tarnishing or misrepresenting the image.

272px size unsuitable to use for high end reproduction.
The copy is of sufficient resolution for commentary and identification but lower resolution than the original cover. Copies made from it will be of inferior quality, unsuitable as artwork on pirate versions or other uses that would compete with the commercial purpose of the original artwork.

Main infobox. The image is used for identification in the context of critical commentary of the work for which it serves as cover art. It makes a significant contribution to the user's understanding of the article, which could not practically be conveyed by words alone. The image is placed in the infobox at the top of the article discussing the work, to show the primary visual image associated with the work, and to help the user quickly identify the work and know they have found what they are looking for. Use for this purpose does not compete with the purposes of the original artwork, namely the artist's providing graphic design services to comics concerns and in turn marketing comics to the public.

No free use image available. As these are fictional, copyrighted characters and a copyrighted publication, a freely-licensed alternative could not reasonably be obtained.

Use of the cover art in the article complies with Wikipedia non-free content policy and fair use under United States copyright law as described above.