I like all the rage in here so I'll give you a detailed explanation.
you should really follow up some tutorials and learn what's truly important in doing gfx.
right now it seems as if you just got yourself a stock, added in a render added some splatters with a clipping mask and DONE.
www.deviantart.com and www.gfxvoid.com can provide you with everything you will ever need to know from a beginner to a proffesional.
here's some basic rules you always need to keep in mind;
- Lighting; Where is it coming from and how does it reflect?
- Depth; How can I manipulate the lighting and focus to create the third dimenson?
- Focus point; How do I create a complete piece without making a distraction?
with these 3 basic rules you can apply basically everything there is to it.