I like Doc's more but here an idea on how to do it..
I used my default settling when first trying a picture..start out calm and work my way into a frenzy!
The calm guys was...
1)I use the adjustment / curves the line by default at a 45 degree angle.
I pick a point about 1/4 of the way up the line and pull it a very little to the right, then I go to the top 1/4 and pull the line a little to the left.
Making a slight "S" shape. I find it It brings out the color.
2) go to Filters and use Gaussian Blur like .05,
then Unsharpen 80%, .5 raduius and 1 threshold.
These settings are almost always my first shot. works for me a good chunk of the time.
The curve brightens the picture the slight blur mellows the noise, and the slight unsharpen defines the lines.
It helps almost any picture...give it a try worse that can happen is you hate it..lol.
Good luck
After seeing it posted I think it could use a little more "S" curve to brighten it a little more.
Lasa