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To be honest, I'm not entirely certain what you want to accomplish.  Can you pls. find an example of the look you want to acheive and post the link.  Before-and-after image pairs would be absolutely wonderful.   For example, do you want an effect that makes it look like there is a bright light inside of each hole (but you can't see any details), or do you hope to see what's actually in each hole?

With respect to the 2nd possibility, let me give a more direct elaboration on Evil's comment: there is almost no detail in the "holes" in the image you posted. If one attempts to "brighten it", all you will likely wind up with is just noise or blotches.  This is why Evil mentioned "recreating" detail.  OTOH, if you could supply the raw data file for that image, one could extract detail from the shadow areas much better.

In addition, because of the strong color fringing (aka, chromatic aberration) present in the image you posted, my guess is that it is a crop out of a larger image.   This is another reason we need to start with a better quality image.

Tom