i really like their design! the second one's pose is a little awkward to me - all four of his legs are on the same plane so it almost doesn't look like his back is to us at first glance. (or maybe is looks funny because he's next to the first one which is in perspective.) the legs of the first one are great and make more sense. but they look great otherwise! :)

I like it. Very nice concept. But the second one's neck look strange, the white strip should not appear in the bottom part, I think.

 They're not, but the original sketcher wanted them there. Thank you though, I'll keep your crit in mind <3

Very nice, but the wings could use more work. Esp their attachment on the back. In fact I'm not sure they're really needed.