This is just perfection. You captured Gamzee's insane facial expression so flawlessly. I find that there is a lack of cosplays that shows this side to Gamzee and if I did find some, they lack intensity.
Like how did you get the horns to stay on place? I've seen a lot of horn tutorials, but never one with Gamzee or Eridan's horn, only horns like karkat and terezi >.< I'm not really good at this sort of thing, haha xD