And now, free for use betta-dragon lineart- something I actually know how to draw!
It's a dragon to be colored like your betta.
The betta's body colors go on the body, hands can be colored like the fins just behind the gills if desired. "Beard" colors go on the ear frills, the colors from the long fin under the body go on the dewlap, the colors from the two smaller fin under the head go on the ends of the whiskers, fin spine colors go on wing fingers and tailtip, and the tail colors go on the wing and tail. Feel free to erase and redraw tail fin shape to fit your betta, this one's a HM/Delta all-purpose tail. Claws and horns should be left white or colored solid black.
Here's Ginji as an example.