Add two layers of shattered glass behind the head. Resize and rotate to suit, blend on screen mode and do some more color adjustments.
Add the crab nebula layer above the glass layers, desaturate and blend on luminosity mode.
Lighten egg shell bits using levels and exposure. Match color of broken egg shell bits with skin tones.
Blur the sunset source and add as new layer, blend on soft light mode at 25% opacity. Render lighting effects and add a vignette.
Adjustments after comments.....
Removed shadows, repositioned and added zoom blur to some pieces.
Thank you to CMYK and Rob for the helpful suggestions.