This is the original image. I had to see it a few times before something clicked. There was something there, but it was buried deep. Would it be worth the effort to dig something out?
Yes, but it was a long and complex trail. A couple of times, I thought I was finished, yet to find another part of the picture to work on. In the process, it passed between three domains -- bitmap, then postscript (objects), then back to bitmap.
The pictures below show the process step by step.