You said your favorite colors were green and gray/black, and this in combination with your name - xXToxikXx - made me immediately think of poison. That was my inspiration for this character.
OKAY - hopefully everything in the design is self-explanatory. I'd like to hope that you can look at the picture and see a cohesive design that doesn't need explaining. But... just in case I failed at making it obvious, here's a step by step breakdown:
I used the color scheme you recommended, and I gave him/her a mohawk and two tails, which I actually think looks really good together ^^ You requested morbid, and what's more morbid than poison? You mentioned you like snakes, so the markings are inspired by a snake's diamond back, I sort of based it on Belcher's Sea Snake, which is the most poisonous snake in the world, except those are blue and gray/black, not green and gray/black, but there's still a bit of resemblance in my opinion. You said you liked flowers, so I included the most poisonous flower in the world - the Autumn Crocus. It's wrapped around his/her leg in a bed of vines. You may not be able to tell, but the vines themselves are a little vaguely inspired by Panic! At the Disco - at one tour they wrapped the microphones in vines. You might be able to find a picture of this on an image search. The other Panic! at the Disco inspiration are the bow ties on the horns (you requested antlers, right? i hope you like them!) - I feel like I think of Panic! at the Disco and immediately think of them in their bow ties. Also on the antlers are a little vial of poison or potion. Hmm... what else should I explain? OH! The hand print - obviously it's inspired by Supernatural, and the burn from Castiel's hand than Dean has on his shoulder
ps: I was going to include piercings, but I thought that was a little too much. If you do want piercings, though, then I will gladly add them, just let me know