That is a real good snap imo. I love the used book store (and the antique store) and try to get down there once a week. The expression on the guy's face is about the same as the expression on the face of my local used book store owner...always deadly serious and matter of fact...
Can we go even lighter, make the guy jump off the page ---- I tend to overdo on PP so then I compensate by not enough in many cases before I post the images. More contrast maybe?