This is so cool! If you want, you could draw mine too. This is Felicity - I got a kinda bad shot of him but it's the most recent color-wise - he's pretty laid back. He's blind due to a lack of black pigment in his eyes, and then double because of scales growing over, and he's very chill because of it. Nothing looks scary to him. He just cruises about bumping into things and moving on with his day.
He's black and white with blue and purple shimmer, and there's white lines and dots that run along his fins. It's not super clear in this pic but he has a lot of the stripe and dot pattern on the back part of his top fin.
I read the first two of those dragons books but... uh, I can't even remember the name of the books, much less the names of the dragon species. I have no idea which one might fit him best.