"Some" details can be enhanced in an image, but considering it is already printed makes it very
challenging.
Do you have (or can you get) the original, digital file?
If so, I'll be happy to take a shot at it, and would do my best to bring out the area in
question.
There is only so much resolution that can be had with a file, and much depends on what
camera it was shot with, and how it was taken (light, shadows, etc.)