That is a nice image but I couldn't resist playing with it a little, after all you do appear to be asking for help...
I don't know much about processing but I have found a couple of things that I find useful. If you have PS v5 there is a tool called Shadows/Highlights under Image>Adjustments. You can use it to bring out dimmer areas (increasing shadows amount) and reducing light in brighter areas (increasing highlights amount). The latter brings out details in the core of your image quite well.
Another useful tool is
Noel Carboni actions for PS. I used one of these actions to smooth out the darker areas in your image a little.