Anas bin Malik reported,
The Messenger of Allah ﷺ was of medium height, neither tall nor short, with a fine build and a brown complexion. His hair was neither tightly curled nor completely straight. When he walked, he leaned forward slightly.
Tirmidhi 1754
Sahihحدثنا حميد بن مسعدة حدثنا عبد الوهاب الثقفي عن حميد
عن أنس قال
كان رسول الله ﷺ ربعة ليس بالطويل ولا بالقصير حسن الجسم أسمر اللون وكان شعره ليس بجعد ولا سبط إذا مشى يتوكأ
Muslim also narrated it in the Book of Virtues, chapter on the description of the Prophet's hair, hadith 2338, from Humayd with this chain, and Bukhari narrated it, hadith 3547, from the hadith of Anas 
. There are also narrations on this subject from Ayesha [coming up: 1755], Bara [Tirmidhi in Shamail, hadith 26], Abu Hurairah [Abu Dawud, hadith 4163], Ibn Abbas [Tirmidhi in Shamail, hadith 30], Abu Saeed [I did not find it], Jabir [Abu Dawud, hadith 4062], Waail bin Hajar [Abu Dawud, hadith 4190], and Umm Hani [Tirmidhi in Shamail, hadith 28].