This is a detail of William-Adolphe Bouguereau's 1873 painting, L'Amour et Psyche, enfants. You can see it along with many other three-dimensional anaglyph conversions from two-dimensional works, in the gallery pages of 3D Gugle.
3D Gugle is software for making 3-D images. It costs anywhere from 46 to 3,500 euros, depending on which version and which license you get, but you can download a 20-day trial copy for free. Normally, I would try a piece of software before writing about it, but I have no plans to use 3D Gugle, because it only runs on Windows, and this is a Mac shop.
Since I am not using the program, I have no opinion whether it is easy to use, or whether it is worth the money, or whether it is the best way to generate 3D pictures. I will only tell you that the anaglyphs in the example galleries are very well done, and very much worth clicking over there and looking at.
I've tried the program. It takes a few hours to pick up, but otherwise it's very easy to use and can produce some very nice results.
This is a great website you have here, btw.