The Light from Within

This is one from a number of years ago when we spent some time on the Big Island of Hawaii.  The only light is from the lingering twilight and the crater.

7D, Sigma 10-20 mm @ 20 mm, tripod and cable release, f/8, 20 sec, iso 100, aperture priority, pattern metering (just to see how it would work).  Processed in LR5 & CS6.  I don't believe this was cropped significantly, but I can't get to the original file right now.
Taken at 9:55 pm on February 2nd, 2011 from the volcano observatory.

Your comments and critiques are greatly appreciated.

Thanks,