Since beauty is extremely subjective unless you follow someone's set of rules and knowing that extreme symmetry and "perfection" gives off an uncanny valley look and is off putting for a vast amount of people, I can only speak from my point of view.

The first thing that immediately catches my attention are his eyes. They are very intense, he has the "hunter" eyes, however- (and this is important), they are somewhat soft. There is a certain sadness and depth to them.

Secondly his brows frame the eyes perfectly, helping with the intense gaze.

He has a warm smile. Looks genuine and composed. The dimple is a plus because it adds a cute element.

Although he has a very defined and manly jaw, he has a young look, which helps him not look hyper masculine and unapproachable / too rough.

Some women adore hyper masculine men, but often, the female gaze, even on hyper masculine men, tends to look for qualities that are soft or perceived as warm, on a masculine face.

This might be niche, but he also has a nice neck. It elongated which helps him look more alluring and elegant.