It seem's to me
that a man is trying to pull himself of out some black hole that he possibly created himself? With the upsetting look on his face I'm willing to bet he regret's making what ever choice that put him in there? With the gun to his head and his mouth and eye's still agape it say's (to myself anyway) that death is not the end but merely a gateway to another adventure? maybe that's why the black void is there.