Huh! SALVATOR MUNDI, selling for $450.3 million last month, a new record. You know what makes me the most curious? The $0.3 million. Other bidders had no problem gathering $450 M, but that last $0.3 M was the deal breaker? There's gotta be a great story behind that!

Nice that the puzzle came out in a timely fashion. I did a double-take on the clue — is it possible that the painting sold less than a month ago? Pretty cool to memorialize such a record-breaking event so quickly (considering that puzzle queue times between acceptance and printing usually are three months to well over a year!).
Fortuitous, that interlock of LEONARDO DA VINCI and SALVATOR MUNDI. Every once in a while, the crossword gods shine down on you.
Such big interlock does constrain the puzzle mightily though, forcing further interlock if you want to incorporate other long themers. David did great with OLD MASTER crossing through SALVATOR MUNDI — perfectly apt for LEONARDO.
But RESTORING ("restoration" sounds better, yeah?) felt like an afterthought; something that would more fit the grid interlock than fit "interesting to a solver." Maybe if the clue had told a nutsy story behind the RESTORING of the painting …
Because of that, the puzzle theme felt thin, more akin to a front-page blurb than a meaty story. Would have been great to get another interesting piece of trivia about the painting itself.
Oh right, there was CHRISTIE, which felt like it ought to be CHRISTIES, and CHARLES I, one of the many people who owned the painting at one time. These were too peripheral to the painting to make me remember that they were themers. Again, casualties of the central interlock.
I would have preferred unlinking LEONARDO DA VINCI and SALVATOR MUNDI so that more interesting themers could be used.
Pretty good grid execution, what with some nice bonuses in X RATED / O HENRY (Xs and Os!), and just a bit of DTS, APR, the odd IN A NET. Not easy to do with so much interlock. And I enjoyed learning about that painting — embarrassed not to have heard of it before!