Okay now, you asked specifically.
-I like the finger bones in the wings, although the wing-top (thumb end) looks a little.. confused, in that I can't tell for sure what is what up there. Also, the wing forearm muscles look a touch odd, am I seeing a boo-boo, or am I not well enough versed in wing musculature?
-You've got the wing humorous meeting the shoulder here, good job.

I am noticing that the wing shoulder seems to be
under the foreleg, which is going to make flight difficult. I'd suggest the foreleg's shoulder be rolled forward and down just a bit, making it just under and just in front of the wing shoulder.
-Speaking of the foreleg, it's forearm looks a bit too human here to me, and the background foreleg's claw looks just a little too much like a hand in comparison to the other claws.
-Nice job with the forward-curved horn here, outstanding texture to it, but where is this thing sprouting from? You have depth in every other part of the pic, except where this horn meets the head, where it looks flat and pasted on.
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This tail rocks, mate. I'm loving it. Only suggestion I could make it to include something to more clearly indicate where the bottom of the tail is, perhaps some kind of line along the top of the under-scaling (and maybe along the bottom of the over-scaling) that says "This section endeth here". Maybe a bit of shadowing where the tail turns, to really make that sucked pop out, because it deserves it (it's a really good tail).
-The head is interesting, but looks a little too skeletal to me. Looks almost undead, and I think you shortened the neck too much, this thing's going to be slow, and mostly only go after things directly in front of it, because it can't move it's head up, down, or sideways very much. On the other hand, if this was the idea, you nailed it dead-on.
Overall, I see this as a very strange beast. It has these glorious wings, but would have trouble using them because of where they are mounted. It has these beautiful, powerful, springing legs, so it should be faster than hades, but the equally long forelegs are going to slow it down unless it does a
lot of leaping (which those hind legs would also be very good at, I think). And while it's body speaks of speed and quick-striking, it is likely to only strike at what it directly in front of it, because that is where it's field of vision is. I might suggest altering to horns just a bit, too, for two reasons;
1) The horn obscures the view of much of the head, negating a lot of the work you've put into the head, becuse a viewer is almost encouraged to not look there past the horn. This short-changes you, because I have no doubt you busted your hump on the head.
2) From the look of it, I'm not thinking that this creature can get any real use out of it's horns, both because the points are well below it's casual line-of-sight (being below it's chin), and because they are somewhat short (they barely reach past it's teeth).
I'm presuming you weren't really focusing on that aspect very much (I'm guilty of focusing too much on one place to get another place right myself, far too often), so that's all understandable.
And, the leathery texture where the wing meets the ribcage is nice, not too symetrical. The problem is the flap between the shoulder and the elbow, because you need some folding of that flap there (because it's loose, unlike the other side where it's taut and stretched).
In short, it never ceases to impress me how quickly you make improvements to your style and technique. Overall, I get the impression that you wanted to experiment with a diferent vision of dragon, and were concentrating on that to the degree that you made some simple mistakres that you normally wouldn't make in the piece like this. I think in a next draft lots of things will improve, especially if you wait until you get some feedback before you start the next draft. ;P
Good work, mate! (I'm brutal, I know, but it's done with love, you should hear the crits
I get! LOL)