The file you have shared with us is a fairly small one. If you get this printed I suggest that you use a large file image. I have made a few tweaks to this file as follows:
1. Go to levels and move the right slider to the left until it contacts the data in your histogram. This will brighten the image some.
2. Use the burn tool on midrange and burn in the fence in the foreground so that it is not the most prominent feature in the image.
3. Go to the Brightness/Contrast tool and play with the the two sliders until your get a brighter image with more contrast. Be careful not to blow the highlights. As I remember I moved the contrast slider to +8 and the brightness slider to +2.
4. Straighten up the horizon line using the fence behind the cars as your guide. There is a tutorial in the Tutuki forum on the Café if you would like to see an easy way to do this using the measure tool.
4. Sharpen the image a little more.
Here is the tweaked image:
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Here is your original:
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This would make a fairly decent poster; however, the fence in the foreground is not the greatest.