In case you're looking for supervised art datasets for machine learning, I made a little art-movement classifier you may be interested in.

Demo here: https://bit.ly/2xClNHz

data and models are available for download.

You can also have a look at art500k which is essentially the same thing. http://smedia.ust.hk/james/projects/deepart_ana.html

Their dataset is also available for download.

I didn't see any, but you could stitch them together, e.g. https://vangoghmuseum-assetserver.appspot.com/tiles?id=56466...

We scraped the site. The website takes a pagesize parameter that doesn't seem to have a limit so we loaded all the images in one page and just downloaded them all.