I would prefer if you chose to go with only one neon, preferubly the green, or added a third color. right now it's between dark and brightly colored in my mind. I like the stripes on his back!
Wow, these are better than what I imagined I think it's really good! There's not anything else it really needs...
Just suggestions, because it's already great, you COULD add glow arround the wings,Edit: I see you already added glow, oops:) or give him a necklace or somthing, but it's already good, so don't over do it if you decide to
Also a suggestion of a name and personality could help you, and esspecialy a backstory