Very simply increasing the contrast slightly will improve the shot hugely. I'd use curves to go about this, though if i recall, you have Elements, which may not have the curves tool. In which case, use Brightness/Contrast, up the contrast a touch and maybe decrease the brightness a touch if the whites are too bright.
Auto Levels will also yield a good easy improvement and this often the case for a lot of shots.
Increasing saturation a touch with the Hue/Saturation tool will also help a bit, be gentle though.
Sharpening is another thing that will give the image more punch. Use the 'Unsharp Mask' (USM) filter. A quick try with the setting at
Amount 75% - Radius 0.7 - Threshold 4 looked pretty good to me.
Doing those things to that picture, or indeed most pictures will yield simple and fast results that look pretty pleasing and working from that as a base will hopefully work well for you. As you get more confident, you can experiment with the Levels tool itself, rather than use Auto Levels for example.
Hope that helps
edit - doing just those steps I outlined gives me something like this;