His current design was made with the help of http://nyarlylicious.tumblr.com/, who does a lot cool art work including the Persona series (there's some Persona 5 spoilers in the blog. Just so you know). I'd recommend checking to see if they have commissions going.

Damien is the third oldest of the Crimson family (second if we do not include Samster). He's rather rebellious, heck the guy wants a pet cobra, but his younger sister (Siri) is deathly allergic to Snake venom. So his mom (Salean) said no, but did that stop him? God no. He has a friend that breeds cobras so he gets one and sneaks them back into the house claiming it to be a "science project", which usually sneaks out. But not too far though. To be in story.