The image also has artifacts / noise in the sky. The large streak on the right side in the sky and the object in the upper right corner are also distracting.
You really need to check your assets at 100%, before submitting. Artefacts like this, seen at 100% are easy to detect and always lead to a straight and easy refusal:
In addition, your iPhone does not manage to get such a blurry background on its own, using the optics, so you used that fake portrait mode, and that one creates nearly always very visible artefacts.
The image also has artifacts / noise in the sky. The large streak on the right side in the sky and the object in the upper right corner are also distracting.