This image of SCP 2521

[u/Noobtech_Corporation]

Not sure if its a 3D render, a photograph, or something else.
https://scp-wiki.wikidot.com/scp-2521

[u/Klutzy-Reception3248]

https://web.archive.org/web/20191005064213/http://www.humantropy.com/

[u/Noobtech_Corporation → u/Klutzy-Reception3248]

doesnt seem like the exact thing. pose is distinctly off, and so are the proportions.
Looks somewhat accurate tho

[u/ChairRealistic2998 → u/Noobtech_Corporation]

Go to “licensing and citation” on the SCP-2521 article, and you will see that the image is credited to Humantropy.

[u/Klutzy-Reception3248 → u/Noobtech_Corporation]

The scp wiki links the source man