I think this one is absolutely outstanding! I like the composition. Also, I think you needed to "paint" in the trees, lest they get lost in the image to the star trails. This is quite stunning. Nice work!
Out of curiosity, how did the D700 hold up as far as noise goes? I shoot with a D300 now, but I've been contemplating the D700 for quite some time. Thanks for sharing your work!
The D700 handles noise just as well as the D3 IMO. I was only at ISO 800 but the long 16 minute exposure did make it look more noisier than if I was shooting at a faster shutter speed. I had the long exposure noise reduction turned off in camera so I could handle it myself in post.
It's a great image. What are those white spots on the lower right-bottom rocks? Stray light from the flashlight?
I never noticed that really until you pointed it out. They are lighter pieces of another joshua tree that you are seeing. Looks a lot less noticeable at full rez. Let me darken the trees a pinch and I will fix that as well and I will post the results when I get to it.
Did some tweaks as per comments: