OK, this is my final fiddle with this image... for today!!
I've played around with levels and curves and have reduced the red hue some more. I think there's more contrast in this one and features stand out a little bit more. I think I like this one more than the previous but I'm not sure...
The main thing is that I've learnt a hell of a lot about processing just from tinkering with this one image.
Anyway, here is the latest version....
Cheers,
Mario