The YCBA (@YaleBritishArt) has been sharing high-resolution images of its collection objects in the public domain since Yale University adopted its Open Access Policy in 2011, and today about 71,000 such images are available for download free of charge, including for commercial usage: http://britishart.yale.edu/collections/search
The YCBA also makes its images available as IIIF assets. We publish a top-level collection that contains child collections for paintings, sculpture, etc. The collections contain the IIIF Manifests for each object.
Machine readable YCBA data can be accessed currently by harvesting XML metadata (LIDO XML)and querying Linked Open Data semantic endpoint (data organized there with CIDOC CRM ontology). Access to or use of the Center’s data and services is subject to the Center’s Open Data And Data Services Terms of Use.