Im curious about this as well, a cursory mod search for something like this has yielded nothing thus far

It could be a painted canvas with an applied image from the ArkScreenshotToCanvas program.

Even if it isn't, imagine you could take just about any image, Screencap or no, and upload it to Ark via this program. I used it to make a painting of the very first animal I raised from infancy to hang in the hall of our tribe's main building.

It requires you to have the dyes for all the colors in the image, and a paintbrush to apply to the canvas, so it can be a bit frustrating if you don't have the dye combo sheet, but it's worth it.