Serene martyr

This artwork is by Gabriel Cornelius Ritter von Max (Gabrial von Max) and is variously referred to as St. Julia or Christian Martyr On The Cross. It is on display in The Hermitage museum in St. Petersburg Russia.
Image provenance by Bacchus at Erosblog.

Another forest crucifixion

This image was posted to a French blog in 2007, and then subsequently reposted in a larger size by the same blogger. It appears to be art photography, but no information on the photographer could be discovered.
Image provenance by Bacchus at Erosblog.

A crucifixion and a volcanic eruption — exciting!

The stray pixels, unfinished edges, and diverse visual textures in different parts of this image make it appear to have been constructed by copying and pasting with image editing software from pre-existing parts (perhaps the volcano image and the anime nude) with additions (the cross, the shackles) added manually by an amateur artist. This has all the appearance of an image constructed by an enthusiast for one of the many active erotic-crucifixion forums and sites, such as this one. Unfortunately no information on the artist could be determined. There is a slightly-different version of the image here (from this thread on a Japanese image forum) in which the heroine’s legs are apart and her body is covered with splashes of unidentified goop. On one site this image is tagged as “Xenia crucified”, supporting speculation that the girl may be a character named “Xenia” in an anime source not discovered.
Image provenance by Bacchus at Erosblog.

Cross of stone

This image appears to be some sort of hentai doujinshi featuring Fraw Bow (aka Fraw Kobayashi), a character in the massive Universal Century (UC) Gundam universe. The character identification rests on comparison of the facial appearance of Fraw Bow (see previous link) with that of the recognizably-similar character in several different doujinshi artworks (including this one of interest) in a Japanese-language image forum thread here. In further support of the identification, machine translation of that thread’s Japanese title returns the phrase “Gundam Heroine Collection”, and machine translation of a caption here (where our image also appears) yields the phrase “is Frau Bow”. The actual image in question appears to be one of two similar images from this sequence of two. The first image features another woman (possibly Sayla Mass aka Seira Masu) who has not yet been on her cross for so long and appears in a less-advanced state of urinary distress. The gallery in which this sequence appears is listed here as 烏乃巣 (no machine translation available) and described as シミパンツ (shimipantsu) which means something like “stained panties”.
Image provenance by Bacchus at Erosblog.

La Sorcière

This is a framed advertising poster for a play (La Sorciere: drame gitan en un acte d’Eddy Ghilain, or “The Witch: a gipsy drama in one act by Eddy Ghilain”) that showed in 1961 at the Grand Guignol theater in Paris. The image probably comes from the poster gallery at grandguignol.com, where there’s also a list of performances of the 1960s, including this one. For interest, there’s an article at Io9.com about the peculiar genre of gory and erotic humor for which this Paris venue was famous.
Image provenance by Bacchus at Erosblog.

Who?

This art is titled “Christmas” as may be seen beside the artist’s signature, and is dated “05” — presumably for 2005. Unfortunately the signature itself is indistinct; it could be “tizmo” or “tizno” or “tilmo” or “tilno” or “tidno” or “tidmo” or a few other less-likely possibilities. It appears to have been uploaded to the Rule 34 image board in 2008. Unfortunately, no more information could be discovered.
Image provenance by Bacchus at Erosblog.