I’ve never seen a Da Vinci with that hue of blue in that chromatic intensity. I would expect that from a Caravaggio who utilized light in most compositions, but not so much with Da Vinci, who often restricted himself to earth tones and sepia. But, then, Leonardo did so much work. Most successful artists try various approaches, i.e. Piccaso. Maybe it is his.
Some interesting details here (as of just a couple of days ago no one seemed to expect this auction to break records):
https://nypost.com/2017/11/14/how-this-100m-da-vinci-masterpiece-flew-under-the-radar-for-centuries/