This is really fantastic! I love the scales and you rendered them, absolutely fantastic. The blue lining that fades helps Spyro to pop out from the white canvas so it works well on my end. The way you faded it in places helps to draw the eye around the entire piece so that's good too. My only suggestion is the arm/legs and wing anatomy. For help with wings, I would suggest looking at bats and the skeleton of it before tweaking it to fit your style. Then for the arms, it seems like the one on the right is bent a little funny but that may just be me. For the legs, that's always a difficult thing, I can't think of how to help to fix it since I have that problem as well but I can suggest references if you can find any. Even a dog would work since (if you know the anatomy of your dragon) you can tweak it to fit your piece.
Again, however, I love this. Honestly, I think it would make an excellent print and I love how the scales in the foreground are the brightest before fading to less detail in the back. It really draws the eye as well as looking very photogenic. (If that makes any sense)