Next to composition, I believe good contrast is what makes a photograph. Whether I take a photo with my phone, with a point-and-shoot, or with a DSLR I always think the resulting image looks flat, especially unprocessed raw files. One of the first adjustments I make to every photo is bumping up the contrast. A subtle change is, sometimes, all that is necessary.
Depending on the photo editor that you use, you may have an auto-adjust button, a contrast slider, or an amplify blacks slider. Play around and see how adding a little contrast will make your images pop. In Picasa, the basic controls look like this:
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Before "Auto Contrast" | After "Auto Contrast" |
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