I have seen photos of purported knuckle prints, and that may be more likely than a flat hand print if the hand is being used as a balance point. I ran your photo through a program called PhotoZoom Pro 6 Brian, it is designed specifically to pull detail from prints. I went very light on the artifact reduction as that can have a blurring effect, used it just enough to smooth out the pixelization. I cropped the result to show just the foot, hand and "knee" print portions. I didn't use the unsharp mask (a seemingly counter-intuitive term photo editing software uses for the tool used to increase sharpness), just what is called "crispness" in the program.