Love it as is. Particularly the ring within the ring, though the picture is magnificent of course. The only thing I can suggest would perhaps be to stylize the numbers a bit more. Use roman numerals or give the numbers a more angular or rigid feel.
The only thing I can think of to improve it, is to have the numbers, that are in the black areas, turned white. It would bump up the contrast value, and even though the blue glow is nice, it doesn't give enough contrast and if you didn't know what the numbers looked like, than you would be confused a bit. I guess if it was a bigger size that would fix the issue, but I thought I would point that out.
Other than that, it's a really nice design. It flows nice throughout the design.