I could lie toe you and say it looks nice and good job, but then you wouldn't get better.
The background is boring, the red glow around the orb is extremely unnecessary (Actually the entire orb is unnecessary due to it being the signature of the renderer), the brushes you used look too plain, and you could have resized it all and played around with the entire piece.
IMO, it looks terrible. Watch some tutorials and you'll get better in no time.

Sorry if I came off harsh. Trust me, you need it. If people say well done then you'll stay where you are, if someone says it looks shit then you'll attempt to create better work.
GFXing is all trial and error.
Good luck.