You could try to retrace yourself, it might be a fun learning process if you have the time to zone out and get back in that creative state again. I know the feeling of having created art and not wanting to try to duplicate it ever again because that art represents a specific moment in time. You could also move on to a different image but try to achieve the same effect again.
Here's some of my work to get an idea of my experience with Photoshop, no filters used, just layers of transparent color over my pen & ink drawing:
http://img27.imageshack.us/img27/320...olesbyafdi.jpg
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