Start off with a higher quality render or stock image first of all. having trouble finding a better render? try
www.sneakybaron.com or
www.planetrenders.net or even on this site in the resource section. As said above the text placement is bad, it is too far from your focal point and is being used to fill negative space. I would suggest just picking a higher quality render and using same sig psd, just try again with diff image. When you sharpen the render tho don't sharpen the entire thing, just the areas that you want to stand out, some areas of his body should be less sharp and blurred slightly. gl and nice idea.