Dhalism

Those skulls look a little flat, especially visible in the right one. I suggest you go back and deepen the darks and push the lights on those a little more.
Apart from that, it's a really good piece, showing off that you have some skill on your hand.
This one and some others don't really fit together with the majority of your gallery, though - in terms of quality. There's just a lot that, when in comparison seeing this guy right here, shows me that it's old as hell because it's not very good, compared to this which is basically pro level.
So I'd recommend you go and reorganise your gallery, putting everything but your very best works in a folder named "Old Stuff" or something or even the scraps, and then start repainting them with what you're capable of now.
But that's personal taste, of course.