Hello English2 In most cases, you'll use "was" for things like that. Note that the painting requires an article: A Jasper Johns painting...
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Grammar GeekNote that the painting requires an article: A Jasper Johns painting...Not necessarilly. "Jasper Johns painting [is] sold for $17 Million." would be typical as a tabloid headline. Or you could make it possessive, "Jasper Johns' painting". Redundant.
Anon