I'd like a recommendation for a brown eyeliner.

3CE Liquid Brush Eyeliner

I saw it on YouTube, bought one, liked it so much, and ended up buying three! One for home, one for work, and one for portability, haha. It looks good under the eyes or as eyeliner. The color is very natural, and even when it smudges, it looks pretty. It doesn't look artificial and makes your eyes look beautiful.

This is an eye makeup product that I am still using well.