Sir, do you know anything about dead space? Of course the cymbals are distracting, it shows how they lose their mind to the marker by disturbing cymbals appear out of nowhere. That's how they feature it in the games, comics and the two anime, because the market corrupts all.
Anyway I know what you're saying, it needs more variety but this is just a simple drawing and putting too much on it can ruin it.
I mean that when you look at the pic, you end up staring at the symbols in the background most of the time My point is that you should totally consider revising the back(add some vague silhouettes maybe ).