Great shot and nicely composed Alex.
You've got a lot of chromatic aberration coming through with way too much magenta in the stars. This is common with camera lenses.
Best solution is to tone down magentas in Photoshop using selective colour tool and select magenta and play with the sliders. Perhaps do the same with blue in selective colour.
That tool works well to reduce the magenta.
Once you've got it right you could do it again knowing the positions of the sliders and record it as an action so next time you use that lens you simply run the action and viola! Its all corrected.
Greg.
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