Yep, that's the moon on the left, and no, this isn't a composite in the way you may be thinking.
The original exposure had many stars in it, but they were quite dim at f/11 and ISO 100. So, I cloned them all out and replaced them with stars from an exposure taken shortly after this at f/3.5, ISO 800, to make them pop. The moon was in the original exposure; it's untouched.
This is NOT sunset - the post-sunset sky color just lingered a VERY long time on this evening. It's rare, but the handful of times I've seen this happen, it has been at high elevation - so I believe that has to do with it. The colors were achieved through white balance, but are completely naturally pulled from the RAW. Obviously I took some artistic liberty with the glow in the LR, but that's just a localized exposure and white balance adjustment.
The light on the tree is partly natural from twilight, and partly from me light painting during the exposure with my headlamp.