Congrats brother, that's a fine looking smoke there. You got excellent smoke penetration, I mean look at that smoke ring, to me it looks damn near 1" wide.
For your lack of bark issue, did you wrap it during the smoke? In that link I sent you, they talk about the woes of wrapping and how that reduces your bark.
Here's a good read on how to create a good bark:
http://amazingribs.com/tips_and_technique/bark.html