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You got two really cool star shots here. I like the detail in the stars, but also like how the arch and the Skull are lit up, it looks like you took advantage of the moon to light them up? I think the arch is my favorite.
The Arch shot was lit mostly by moon light. I did have a red-filter on my flashlight to paint it for a very short time though. From my limited experience, shooting very long exposures, even crescent moon lit, is enough to fill the foreground . The Skull Rock was lit by the moon and also my flashlight coming from the right side.