Paintify - Image Filter
This is a filter that processes an image to have craquelure similar to "Italian" pattern craquelure, for that distinct renaissance "Louvresque" feel. :)
You can see it applied at Sketchfab
Also this is a great way to upscale small sized images intended for 3D environment production, since it adds a bit of depth and detail to the overall processed image as it generates Normal, Height, Roughness and AO map as well.
All example images used are artful divinations of Zhillustrator, so if you like those be sure to check his Artstation site for more of his fantastic artworks.
To use it you would need Substance Player, freely available at Allegorithmic.
Included in the package is .sbsar used within Substance Player, test image, and a small how-to read me file. Feel free to use this in your personal and commercial projects, and if you find it useful any donation would be greatly appreciated!