Darthbeck, not only is it a DeviantArt work (Which means it belongs to someone) It's also soooooo old.
I used to use that in my sig. When I was 13.
Aaaanyway, Death isn't cool, it's a painful and horrible thing that rips people away from their loved ones. The Grim Reaper is kinda cool, but remember that words or pictures can never instill fear in a person. Emotionally, saying something like "I'm Death!" isn't particularly scary.
But, each to their own, if you enjoy the feeling of Death in your avatar, then enjoy it.