With regard to the appearance of Hazrat Ali (ra), it is mentioned that he was of average height, had dark eyes and was of a heavy build with broad shoulders.
(Ibn Hajar al-Asqalani, Al-Isabah fi Tamyiz al-Sahabah, Vol. 4, Dhikr Ali bin Abi Talib [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 1995], 464) (Ali Ibn al-Athir, Usd al-Ghabah fi Ma‘rifat al-Sahabah, Vol. 4, Dhikr Ali bin Abi Talib [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 2003], 87, 88) (Ibn Abd al-Barr, Al-Isti‘ab fi Ma‘rifat al-Ashab, Vol. 3, Dhikr Ali bin Abi Talib [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 2002], 218)