Basic structure of this grid is sound. No crossovers. It's weakness, however, is the Mona Lisa linked clues. Apart from the three misspellings, the value clue is erroneous as there are numerous estimates for what is a priceless work of art. May I suggest, 12349, that you could have substituted, say, La Gioconda for this clue. Sorry to be long-winded, just trying to be helpful.