Crystal dragon OC descriprion

I guess I had to start with this one before uploading [link] These two are my OC in a story I'm writing recently. The drawing is actually pretty old and is the first one with Kiril on it. That's why by now he doesn't look exactly the same way (despite of the fact that he's mostly in Vulcho's skin). His hair must be more disheveled and... I don't know
Let me introduce them

Radostina Vodeva (Radost)
Age: 25
Height: 169 cm.
Eyes color: sea blue, a bit greenish
Hair color: fire red
Personality and history:
Radost is a visionary artist. Her name means 'Joy' and she really is a joyful creature... sometimes. She spent the last 10 and more years creating the imaginary world of the Crystal dragon. After all this time she successfully publishes it as a little book with her own illustrations. Months later she's hired by a big game development company to help the animators with creating the images of the characters in their new game which is actually based on her book. There she meets Kiril and their relationship quickly grows into a strong friendship.
Radost is smart and proud, she hates if someone's pushing her to do something and if they hurt her pride she's absolutely capable of making them freak out. She's very passionate and a bit wild, sometimes she acts childish.

Kiril Trichkov
Age: 30
Height: 197 cm.
Eyes color: black
Hair color: white
Personality and history:
Kiril is member in the Animation department in the company and since he’s the most creative, his boss made him the head animator. He’s a workaholic, literally living for his job and when the company is idle he’s really bored. The ‘Crystal dragon’ project brings him back to life after a few months of doing ‘nothing’. Soon the world of the Crystal dragon becomes part of his dreams and Kiril himself turns into the White sorcerer Valcho from Radost’s story. A few weeks after meeting Radost the young man realizes that he cares about her a bit more than he would care about just a friend.
Kiril is a bit freaky, crazy and often absent and careless. He’s feeling kinda protective about Radost.