Original post here. This image was researched by Bacchus at ErosBlog as part of the “Γ commission.” The research was originally published at Hedonix as “Γ 050 – Into The Cosmos.” Here is what Bacchus found.
This is an illustration by French artist and cartoonist Jean Giraud, also known (especially for his comic book work) as Mœbius and sometimes as Gir. (His official website is here.) The illustration is titled (at least by art auctioneers) Les Robinsons du cosmos, and according to this site, it appeared in 1970 as the endpapers (“Pages de garde”) of a book by Francis Carsac called Ceux de nulle part – Les Robinsons du cosmos. (Machine translation makes something like “Those of nowhere – The Robinsons of the cosmos” out of that French-language title.) See also this page for more information. A close examination of the cover art and book description here suggests that this was perhaps a book club edition packaging together two novels by the same author, hence the oddly long dual name.