Loving the setup only thing I would change would be the dragon to the one in the imgur link (ill relink below )
Since it's rhe dragons head I think my imgur link head would look nice with it even though a paler colour then your blue and to animate frost and Flames and she's perfect , loving the accents on the sides with the red and blue to match so as I said I'd just change the head in yours to the other head and animate some frost (mist)or ice (sparkle ) and makes the Flames on the Phoenix tail flicker like Flames and she will be perfect
https://imgur.com/a/juzUADi