She is unaware of his gaze. His eyes averted yet another time.  
When she turns her head toward his, his eyes drop away from her beautiful blue.  
He is sure that if he were ever to meet her glance head on that he could not pull away

Besides, it is not for mortals to ever gaze upon the gods directly.
So he looks away into the fading sunset that is turning a lovely shade of pink.  
It reminds him of the color of her soft parted lips.  
He feels compelled to steal yet another quick glimpse of her radiant beauty.  

The remaining rays of sunshine are making her golden waves shine with a luster reserved only for beings of an ethereal nature.  
The wind carries with it the sweet smells of flowers, fresh in bloom, as if it were still springtime.
As she passes him by the scent overwhelms his senses and he feels his legs grow weak.  

He catches his self before she can see any deviation in him, but he is unable to move.  
He just stands out of fear that if he tries to move, he will lose the remaining strength in his legs and plummet from Olympus.