This image is a reblog from this 21 June 2015 post at Infernal Wonders. It’s a crop from the January 1958 cover of Science Fiction Adventures.
According to the Internet Speculative Fiction Database the cover is the work of American illustrator John Schoenherr (1935-2010), who is famous for, among other things, providing the original cover illustration to Frank Herbert’s Dune.
This image is reblogged from this 10 May 2015 post at Infernal Wonders. A note from the source tumblr indicates that it is a detail from the cover of a 1970s Spanish comic Escorpión, issue #28. I couldn’t find too much about this publication, but its entry in the Grand Comics Database indicates that it was published in 1973 and 1974. They don’t have many covers, but those that they do have suggest that scantily-clad women being menaced by giant invertebrates was a repeat thing.
This exquisitely-detailed pencil drawing is by prolific femme peril artist Steve O. Reno. His comment on it was
Superheroines tend to be magnets for these tentacles. I don’t know where they come from, I only care about where they’re going!
Steve has a remarkable DeviantArt site. The image appears here by his kind permission.
Another image reblogged from this 19 April 2015 post at Infernal Wonders by Alfonso Azpiri.
This image is Deepside by Hong Kong artist kamenwilliam. It is here reblogged from this 13 April 2015 post at Infernal Wonders.
This image is reblogged from this 13 April 2015 post at Infernal Wonders. It is Tentacle Rookie 2: Back to School by the British artist Carlton Doorman, who has a DeviantArt site under the name of sweetmouth. He has reworked the illustration in color as Bikini Night School Tentacle and there added a fetching blush to our young protagonist.
This image is reblogged from this 23 March 2015 post at Infernal Wonders. It is Grafite Meitom by the Brazilian artist Pedro Vale who has recently published a new color version of the same illustration.
This image is reblogged from this 22 March 2015 post at Infernal Wonders, and can be attributed (per the content) to the site Taurus Artworks, which has a lot of this sort of mad-science bondage thing. Surf over and enjoy if you do!
I’m not sure the spandex is the most nutritious bit, Mr. Mars Monster.
This image is Bikini Eaters from Mars 2 by the German artist Krakenkatz (formerly GrandPa). If you like this sort of thing, you should check out his peril-icious gallery. The post is a reblog from 16 March 2015 post at Infernal Wonders.
The ocean is a dangerous place if you’re pretty.
This image is a reblog from this 9 March 2015 post at Infernal Wonders. The provenance of the illustration isn’t completely clear, but it bears a signature “Kras 2008” and a printed link to Legion Comicx, apparently a Spanish-language publisher of, among other things, erotic horror comics.