MLA (for more examples see Purdue OWL):
Lastname, Firstname. Title of Work. Year. Medium. Institution housing work: Location of Institution. Website name. Website sponsor. Web. Date of retrieval.
Ofili, Chris. No Woman, No Cry - view in light. 1998. Mixed media on canvas. Victoria Miro Gallery: London. Google Arts & Culture. Google Cultural Institute. Web. 18 May 2017.
APA (for more examples see APA Style Blog:
Lastname, A. A. (Year of composition). Title of Work. [Format]. Place work resides
Ofili, C. (1998). No woman, no cry - view in light. [Painting]. Retrieved from https://www.google.com/culturalinstitute/beta/asset/view-in-light/bwEqkX2cKDce7Q?childAssetId=ygGPI7L9OPC7TA