It can be tempting when looking for art images to just go into Google and take a random result that comes up. Be very careful about using art images found this way that you have gotten the correct image. Beware: images on the web are often mislabeled.
It's generally safest, when possible, to use an image from the museum where the art work resides.
Google Arts and Culture is a good option for browsing different museum collections. Google has partnered with museums to provide these digital collections. Be aware, though, that many of these images are not downloadable.