For a first it aint bad, the texture and gradients on the text work quite well.

The Z is a little too dark.

Dont use that Shattered glass, thats been around longer than some of the people on this board have been alive.

The lighting doesn't make any sense to me. Particles on the left are clearly illuminated, yet that's the darkest area. Where's the light source exactly? Use the burn and dodge tool to fix that.

The text has a relatively mediocre texture but I've seen much worse.

The background is pure blackness, not enough going on in the whole piece.

The shards on the text itself look like they're there for the sake of it, and aren't blending well at all. Either reattempt them or scrap the idea.

There's a clear cut-off point where your glass shards image ends. [ Register or Signin to view external links. ]

The glass shards overlay honestly looks like you hit File > Place and then turned the opacity down a little. It's also not placed very well, as it distracts the viewer from the main segment of your piece - which I assume is the text, as is the case with many other pieces of this style. I have a feeling it would look much better if it were behind the text.

Overall I would say that the piece is very bland and it doesn't look like you put much effort into it. If I were to rate this, I would give it 2/10. I hope to see your future work and how it improves.