I'd say that one looks good. In my opinion, Cinnamons should be a light brown 'cinnamon' color. Whereas with black pastels the darker the better. It really all depends on what you like.
It's definitely a cinnamon and a pretty nice one. It does look like its going into shed. It looks rather dull but for that price I'd check it out in person. If its healthy I'd go for it.
Factoid: "There are no such things as Hogg Island or Columbian boas"
Really nice cinny but make sure they all look that nice. Teres only one pic but he says he has multiple males. Also i wouldnt get more than 1 as far as breeding goes...