Gleb,
As I understand it, ULAN doesn't attempt to include artwork
information in its scope. That would be covered by the Getty's CONA
project (not yet available as Linked Data), or by individual museums
including ULAN URLs when they publish their collections information
as Linked Data. I'm not aware of either being a practical option in
the foreseeable future, but would be delighted to learn otherwise.
BTW, have the Getty published widgets which make it easy to add
their URLs to collections data (c.f. [1]), or to display a
human-readable summary in a popup? This might make it easier for
institutions to enhance their data with Getty Linked Data URLs.
Richard
[1]
http://www.heritagedata.org/blog/term-suggestion-in-a-widget/