That photo is great. Obviously, it was taken mid-attack, so we can't read too much into his grimace. But Contador also didn't look entirely comfortable in many of the photos in one of the links posted by Cimber. In my mind, that only underscores one of his best qualities: that he almost always races to win, whatever the circumstances.
This is a little bit off topic, but I thought someone posted in another thread that Contador told Sanchez he'd attack. What was Sanchez doing sitting a couple of wheels behind Evans and Basso? I would have expected him to be glued to Contador from the base of the climb if he knew what was about to unfold. Obviously, Sanchez bridged eventually, but it might have been interesting if he'd reacted more quickly and the two of them had been able to collaborate to make that first attack stick (possibly they'd have taken more time from the others, and a bit of time off Evans too - pure speculation of course).