Not too bad, one thing you should work on would be your flow. In this piece its all over the show, you have a lot of straight lines going in different directions. I agree with Horus about the canvas dimensions, higher would have been better than longer, infact this render would have made for a much better vertical tag.
Always look at the render to see where the lighting needs to go. The majority of the lighting in there is on the left edge, when the man light source needs to be above the render and a few lighting effects around and close to the render.
Try to take your time when it comes to blending, this is a process done over the entire making of the tag. Many people make the mistake of throwing a few adjustment layers in their tags, and say yay its blended but its not the case. The adjustment layers simply complete the blending and lift the atmosphere, the rest comes from using the right effects in the right areas as well as having a good balance of lighting and shading,flow,depth and colors. All these things count when it comes to blending.
Last but not least your text, using simple standard fonts is fine. Infact the often work better than fancy fonts, but you need to make them exciting. Using two words and one color isn't very exciting, so try to spice it up a bit. A good font match is ariel and impact, also try to match the size of your text to the size of your tag, it needs to compliment the render not over power it. So add some color to it(not all the same color) add some tiny text brushes, and even some asian text would look good.
Anyway just keep practicing and you will begin to pick it up. Here is a link to what I think is one of the best guides out there, it explains everything in good detail. Its a long read but well worth it, it also has a tutorial at the end of it. I uploaded it to my mediafire account so feel free to download it if you wish.
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