The Bible does not go into much detail regarding the physical appearances of the people it talks about. Many of the central figures were from the Middle East, so we assume they had features characteristic of Middle Eastern descent, such as olive-toned skin, dark hair, and dark eyes.
When Samuel was sent to anoint David as king, he first thought that Eliab, one of David's brothers, would be the anointed. But God told Samuel, "Do not look on his appearance or on the height of his stature, because I have rejected him. For the Lord sees not as man sees: man looks on the outward appearance, but the Lord looks on the heart" (1 Samuel 16:7). Proverbs 31:30 tells us "beauty is fleeting" (NIV). First Peter 3:3–4 says, "Do not let your adorning be external—the braiding of hair and the putting on of gold jewelry, or the clothing you wear— but let your adorning be the hidden person of the heart with the imperishable beauty of a gentle and quiet spirit, which in God's sight is very precious." Isaiah 57:15 says God dwells "…in the high and holy place, and also with him who is of a contrite and lowly spirit, to revive the spirit of the lowly, and to revive the heart of the contrite." Second Corinthians 5:7 tells us we "walk by faith, not by sight." Over and over, the Bible emphasizes that God is most interested in our hearts and the state of our spirit. When the physical details were necessary to convey a narrative or other biblical point, God shared them. Otherwise, we know much more about who people were and what they did than about what they looked like.