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Some very nice shots there. I like the one with the tree, the creek and cattle station with the blacker sky. The creek shot even though no night sky is a very appealling photo.
Some of them have a magenta cast. Make sure you shoot in RAW and the white balance is a critical adjustment. I find on my Nikon and Fuji cameras setting the white balance to the temperature of 4350 Kelvin looks perfect. It may be slightly different with a different model of camera but its likely to be similar. Setting the white balance correctly is the next most important setting after aperture and exposure lengths.
In your processing software that came with the camera there may be colour defringing as there is a little bit of blue/purple star fringing from the lens. There are no stars that are magenta in colour. So that is something to keep in mind. F1.7 is probably great during the day for background blur but for stars it tends to show false colour around stars. You may need to try stopping down to F2.8 or simply correct in processing as above.
Greg.
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