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Sharpened the whole image but used Smart Sharpen in CS2 which knows what to leave alone and what to sharpen. You could try selecting an object of interest and sharpening it on its own - it works but you've got to be careful as it can look very strange if its overdone.

There's a load of different ways to work on one part of the image - duplicating the whole image, adjusting levels, curves etc for the part you are interested in then using eraser to carefully expose the unaltered background is essentially what I did. I lasso out of habit as I get put off by the rest of the image going black when I'm working on something light.