OK, took me a while to get in the right mindframe, but I absolutely had to critique this.

To start off with, the deviation itself so matches the way I've always seen Spock. Simplistic and straightforward at first glance, but the deeper you look, the more complex and faceted.

I love how you've captured Spock at his most vulnerable in the latest movie. There had never been any true prior focus on the trials and tribulations faced by our most beloved half Vulcan. The look on his face is perfect in this drawing, mostly expressionless with that slight bit of anguish and sorrow "peeking" through with the downturn of his lips.

The shading and simplistic background do an awesome job of putting the right touch of focus on him. Even without extra scenery, you convey exactly what he's going through, and give the perfect picture to the viewer.

Bravo for a most excellent deviation. Live long and prosper!