If you inspect your photo at 100% - 200% magnification (which you should always do before submitting) it is clear there is a noise / grain issue (probably from oversharpening.) Take a look at the horizon where it is very noticeable.
There is also an unfortunate flare / sunspot on your model which would look better if it were removed.
I hope this helps.
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You have lens flare - round spot near the bottom of the picture, and it's a bit underexposed even though you wanted a silhouette. The focus doesn't seem to be very good either.