Oh, I voted on this subject and yet completely forgot to voice why I chose said options.
My votes went out to hair and eyes.
Hair is generally the first thing you see on a person. It's vibrant, sometimes flowing, and often distracts you from other features of their face. It is that reason that I tend to notice hair before anything else.
Eyes, on the other hand... Eyes are quite the beautiful things to behold. When you're looking into someone's eyes its like starring into their mind and/or soul. It's an intimate moment whenever you look someone in the eyes, therefore it is quite different than hair. In order to see the beauty of them, you must approach the person in question.