Initial thought:
Cartoons!
Yilx
KoA
Wyverii
Cartoons! captured my attention first, his design had a lot of character just from its appearance.
Yilx did a great job distinguishing his from some of the more generic bipedal dragon designs. His was the most unique of that kind of design.
KoA's is definitely a different take on the concept, and breaks into ground most others didn't venture into.
Even with all the other fairly generic Western Dragon depictions that followed it, Wyverii's kept a uniqueness and style all its own.
These are the four I've chosen, but I'm simply blown away by the sheer number and quality of designs. Good job CAP Artists.