I don't know if the guy who did these has any artistic ability of his own. A lot of people don't (as many webcomics show). He took the art by James Bama from the Bantam paperbacks and incorporated it with stills or publicity material from old movies, producing some amusing and evocative results.
Personally, I would really like to have seen a Doc Savage crossover with the Shadow. Both Will Murray and Philip Jose Farmer mentioned the possibility but it didn't happen. Doug Moench said he planned a big clash between Doc and Fu Manchu back when Marvel had rights to both characters, but again it didn't come to pass.