Moonlight tentacles

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This image can be found in two places on the web: on this page of bondage electrocution pictures and on this image board. In the latter place the image is accompanied by the following legend: 懐かしいな竜の玉座 Sadly, machine translation is not illuminating, and no other information on the provenance of this image could be discovered.
Image provenance by Bacchus at Erosblog.

R-N-A

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This manga image was uploaded to the Fembot Wiki in April of 2010 with the filename “BLUE087”. It appears to be a digital photograph from the interior of a printed manga book, based on the page edges visible at left and the curved page edges top and bottom right. The “R-N-A” may be a book or chapter title. Unfortunately, no further information on the source manga could be discovered.
Image provenance by Bacchus at Erosblog.

Shark attack

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According to this blog post, this image is artwork from a 1975 Japanese gekiga comic book official tie-in to the original Jaws movie, published by Herald Books. Another site explains that gekiga is not manga, being instead “a more dramatic style of Japanese comic art aimed at an adult audience.”
Image provenance by Bacchus at Erosblog.

Bad frogman

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This artwork is one panel from a two-page comic strip called Carrie that was drawn by artist Don Lawrence. The strip ran in Mayfair magazine for many years; this particular comic is titled “Carrie’s Vacation Fun” and ran in the July 1973 edition of the magazine. The Carrie’s Den site offers a detailed index of all the Carrie strips.
Image provenance by Bacchus at Erosblog.

Religious ritual

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A less-cropped version of this artwork here identifies it as “Pencil work for cover illustration” from The Young Witches comic. The final cover art in color was for Young Witches 3: Empire of Sin, drawn by artist Francisco Solano Lopez and published by Eros Comix.
Image provenance by Bacchus at Erosblog.

Violet monster

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This artwork is the cover of a French-language edition (Série Verte #123) of the Italian fumetti Storie Blu #62: IL MOSTRO VIOLA, which featured the same cover art with different text and was drawn (according to this site) by Manlio Truscia.
Image provenance by Bacchus at Erosblog.

Pretty pet-boy

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This artwork is by French femdom and spanking artist Waldo, who maintains a blog here. The artwork can be seen with many others in this gallery. Very little English-language information about this artist is available.
Image provenance by Bacchus at Erosblog.

Brain dog and friend

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This is an image from a 2006 Japanese DVD called Laboratory: Level 2 Final Round. Essentially no information about this title is available in English, but this Japanese-language page appears to have some additional information.
Image provenance by Bacchus at Erosblog.

Crops

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This image was uploaded to the Sankaku Complex image board about four years ago, but no artist information is available. It has subsequently appeared on other image boards (here and here) and is advertised as being part of the content of a commercial porn site called Hentai Tentacles. However the diversity of promotional material there makes me suspect that the site’s claim to offer “100% exclusive Hentai” is false; it looks more like images collected randomly from around the ‘net. However if the claim were actually true and the art was truly created for exclusive display on that paysite, one might expect that artist information would only be available to members inside the pay area of the site, or perhaps not at all.
Image provenance by Bacchus at Erosblog.

Virtual reality

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This animation consists of several frames from the original video animation Parasite Dolls, which is set in the Bubblegum Crisis universe. This review displays one of the frames from the animation above the caption “Cyber junkies get off on experiencing Boomer fatalities.” The Parasite Dolls OVA is currently available on YouTube.
Image provenance by Bacchus at Erosblog.