A useful website to find pictures and paintings is https://tineye.com/

[cranberryartworks]

I use it all the time to track down a picture or find a larger version. it has been around for a long time.
I even use it to get the name of the location of the picture.

TinEye Reverse Image Search

TinEye is an image search and recognition company. We are experts in computer vision, pattern recognition, neural networks, and machine learning.

tineye.com