Well, honeslty, I think the picture itself is essentially fine except maybe where you focused and/or your depth of field. If you increase your depth of field by changing the F/stop (aperature) to a smaller number, your depth of field will increase, bringing more objects into focus both in front and in back of your focus point.
The only other problem (and a very common one) is bright light behind your subject which tosses the picture out of whack and sometimes leads to underexposing your actual subject. This didn't really happen too much with you, but when you adjust the picture to bring your subject more into an appropriate exposure, it does "wash out" the background and make the light somewhat harsh beyond those wood planks, which is just a bit distracting.
The real trick is in your processing... pretty much ALL digital images need to be sharpened, and for that I'd use photoshop and look around for a good tutorial on the web on the unsharp mask filter. It's excellent (and is what I used for your pic). Also, for my money, 90% of pictures I see need deeper contrast... lighter lights, darker darks. Again, use photoshop (or any tool really) and play with the contrast until it gives your image real punch without losing too much detail in the extreme dark and light portions of your picture.
the most likely third thing you'll have to play with is your color balance... again, photoshop.

This is another thing to go online and search for good tutorials.
To find the tutorials, literally go to google.com and search on "xxxx tutorial" where xxxx is your subject of choice. You'll find a lot.
Hope this helps!