That's about what you can expect from that setup with that amount of data. The mid tones could be stretched a little more... focus could be sharper. You won't get a blazingly bright horse unless you collect mega data, or have a fast optical system or have an astro modified camera either with a filter mod and / or cooled.
Try and shoot it at the highest possible elevation to avoid atmospheric scattering, collect more data and stretch the midtones a bit more.
Some people make the horse look easy, but it isn't!
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