I have a very simple argument in favor of objective human beauty.
The Bible calls Absalom and other characters handsome
2 Samuel 14:25 NASB — Now in all Israel was no one as handsome as Absalom, so highly praised; from the sole of his foot to the crown of his head there was no defect in him.
According to 2 Tim 3:16, and according to the books of Samuel internally, this is God's word, not an opinion of the human writer.
Therefore;
Objective beauty exists since it is recognized by God.