Shama-il Tirmidhi Chapter 034, Hadith Number 001 (216).

Jaabir ibn Samurah radiyallahu anhu says, The calf of the leg of Rasoolullah sallallahu alaihe wasallam was slightly thin. His laugh was only that of a smile. Whenever I visited Rasoolullah sallallahu alaihe wasallam, I thought he used kuhl on his eyes. Whereas he had not at that time used kuhl.

Commentary
Verily the eyes of Sayyidina Rasoolullah sallallahu alaihe wasallam was like that which had kuhl on it.