I think these guys ended up selling pretty well. I'm very fond of them myself. Here's the original concept I sketched before deciding on the final on the bottom right:
I also ended up creating a statue of the grown up version of the dragon with plans to have it also be an animated characters with multiple versions, but unfortunately I was placed on another project before that plan was carried out.
There was one other character I created and animated for Fantasy Kingdoms and it was the Harpy. I don't think she was very popular with the audience in terms of sales, but I still had a lot of fun drawing and animating her:
And last, here is the concept I did for the Harpy: