The depth created is great, though sections could still do with refinement. The render itself and the areas in focus are over-sharpened - so if possible reduce that a little. The blurring on the left comes into focus much too quickly and appears a little unrealistic.
The highlights and shadows of the render you've used indicate that the right side of his body is cast in a slight shadow - so shift your lightsource at the top across to the left, and remove the glow from the right hand side. The fractal placed at the bottom around his torso is also a lightsource, rub away from the top left a little as it recedes into darkness.