1) Very underexposed...like a few stops under.
--if the wall was very white it could have tricked the cameras meter to thinking it was over exposed. what mode were you shooting in (M, Av, Tv, etc.) Bump the levels in photoshop.
2) Very flat...add contrast.
--this typically comes when an image is under exposed. Raise the contrast in photoshop.
3) A little boring...make the light a little more directional and this would be ver cool.
--the wall is very evenly lit behind him. This produces little seperation between him and the wall. If possible add more contrast to the image by adjusting your light.
Light is crucial to EVERY image...weather it be lots of light or very selective light.
4) Here is a sample I photoshoped for you to show you that this image can be salvaged. Very easy edits. Levels, contrast, dodge, burn, colorize.
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