Beauty is something that can't be described. It is something that lives inside you. A person can be not very pretty but there is beauty coming from his soul and his look. What influences our beauty and inner state?
Of course, love is on the first place. Love makes you fly and nothing can change your mood. It's like you are in your own world protected from various surrounding troubles.
The second thing that makes my eyes shining brightly is the weather. When spring is coming my mood is getting better. The weather is wonderful and it speaks about changes in life and the fulfilment of your dreams.
Anyway, beauty is a thing that goesto and fro. Various conditions influences it.