Hooooooly crap. I can't believe you put "he's not horrible" and linked to that page in the same sentence. I had no clue who he was/is and let me say those covers...they look like amateur hour in Photoshop. For high schoolers. Seriously. The above cover is the best of the lot.
I'm not saying he didn't "ref" the pose, I'm saying it's obvious (now even more so with that link) that he uses photos as a crutch for his lack of anatomy/lighting knowledge. So when he picks up ref that's been poorly re-touched, or he chops it up to suit his needs, he's got no clue how wrong everything is. I'm all understanding that unskilled art comes out when you're learning, but this dude is getting paid by a major company. It boggles my mind.
I was always taught to send sequential pages to publishers 'cause they had all the awesome cover artists they ever needed, but this. This reminds me why I question that often.