I do like this Richard, it makes for a fine abstract. As a bit of a novice it is reassuring to hear that it took 40 attempts to get this.
The histogram is heavily bunched to the left and I wondered if this was done deliberately to achieve your desired look?
Anyway, I thought I would try a mod and see what happens. All I have done is a simple level and curves adjustment to increase contrast which I think brings out the texture more. The increased contrast pushed the colours a bit much so I desaturated.
Your feedback would be appreciated.