y so mono?
Not really into the lighting and the choice of colors, the compo of this piece could use some work. You need to work on the background blending, it doesn't seem that blended well. There is a very small amount of depth here, you need to work on your depth, to achieve nice depth, you need a good bg, the bg doesn't quite cut it here, work on the brightness and contrast of this piece, and the topaz is fuckin' ugly.
Imo, the tag is very simple and has too much of a beginner feel to it, try reading more advanced tutorials and giving them a shot.
Drop border and text, yo.