Eddy,
Nice shot. I have a few similar to that:
Do you have Adobe Photoshop? or Paint Shop Pro?
To see more stars, follow these steps. Make a copy of your original and name it something different so you won't mess up your original.
Open the copy and create a layer from the background.
If you use your magic wand selector with about 26 as the tolerance and select the black background it will select all the black and not the two or three stars and the moon.
Next, use your auto levels in PS or its equivalent in PSP. This should make the black background show lighter and all kinds of greens, blues and alot of noise.
Unselect what you have.
Change your tolerance on your magic wand to about 76 and pick the noisy background. This should select everything but the original stars, the moon and now any brighter items in the background. BTW, all this should be done on the new layer and not the background layer.
Now get your brush and make it large and use black as the color and paint the background back to black.
Unselect everything.
Now get your erase tool and erase the moon so that the moon from the background shows instead. If the brighter stars don't look good to you erase them so the background stars can be seen.
Bam!......more stars. I tried it with your photo, but the black background is really mostly black. I didn't find many more stars like in my photos. I shot with a Canon 10D, 75-300mm lens, and various exposure times while using the timer to minimize any camera shake from my depressing the shutter button.
Bo