Choosing the right mascara for dark skin can be a bit challenging, especially if you're looking for a brown mascara that will complement your skin tone. However, with a deep understanding of the interplay between color, skin tone, and makeup ingredients, I can recommend some of the best picks for brown mascara suitable for dark skin.

1. Benefit Cosmetics They're Real! Lengthening Mascara in Brown: This mascara is known for its lengthening and volumizing properties. The brown shade is rich and deep, making it a perfect match for darker skin tones.

2. Maybelline New York Great Lash Mascara in Brownish Black: A cult favorite, this mascara offers a slightly softer look than black mascara but still provides excellent volume and length. It's also ophthalmologist tested and suitable for contact lens wearers.

3. Clinique High Impact Mascara in Black/Brown: This mascara is perfect for those who want a more natural look. It adds volume and length without clumping, and the brown shade is subtle and flattering on darker skin tones.

4. L'Oreal Paris Voluminous Original Mascara in Deep Brown: This mascara is known for its ability to build volume without clumping or flaking. The deep brown shade is perfect for enhancing the eyes without overpowering them.

5. Bobbi Brown Smokey Eye Mascara in Black Coffee: This mascara is designed to create a smokey eye effect. The Black Coffee shade is a deep, rich brown that complements dark skin tones beautifully.

When choosing a brown mascara, it's important to consider the undertones in your skin. If you have warm undertones, opt for a brown mascara with red or orange undertones. If you have cool undertones, choose a brown mascara with blue or purple undertones. This will ensure that your mascara complements your skin tone and enhances your natural beauty.