I like these kinds of images, and have tried putting them over. Sometimes they do well..sometimes not. This is a very nice one with intricate details and you've placed it nicely. It almost could be a fancy fractal!!
This makes me think more of depression - or maybe envy - than of anger, but that doesn't stop it being a great image. I like the way this seems to suck the viewer in - and not into something especially pleasant. It makes me think of emotions and thoughts and obsessions which consume those experiencing them, eating away at their selves as if they have a life of their own...
I wouldn't have especially noticed this being off-centre, but if it isn't centred (it may be more obvious on the desktop than in the preview) I'd second purmusic's suggestion about that - along with the comment endorsing your choice of colour scheme.