>This could be added to equation, I guess you're thinking of measuring demand?
Demand, and market. The more people you have following you, the better the chances that one of them is willing to pay premium prices for premium work.
I like your range. Cascade's watery mane/tail, the metallic shine on Dreamweaver 2's collar, Nether's red lightning... there's lots of different materials and textures in your work. Even the hair varies in luster from character to character.
There's a variety of poses and facial expressions, both subdued and energetic, I love seeing this. It does a lot to bring out the personality of the character.
The lighting is fairly limited. Most everything is rendered with a very soft, ambient light. There are very few sharply defined shadows, none of the scenes have warm, cool, or harsh lighting, nor is there a clearly defined direction. The lighting primarily serves to add definition the shapes, materials, and textures (which it does very effectively), without adding to the mood and ambiance.