Certainly, brown mascara can be a great choice for those with dark hair, as it can provide a softer, more natural look compared to black mascara. Here are some top picks that are not only effective but also adhere to clean beauty standards:

1. Ilia Beauty Limitless Lash Mascara: This is a buildable and flake-free mascara that lifts, curls, lengthens and adds just the right amount of volume. It's made with organic bee and carnauba waxes to weightlessly condition each lash.

2. RMS Beauty Defining Mascara: This mascara, rich in organic plant waxes and select raw minerals, allows you to shape lashes into any look you desire, from a subtle, long lash to a bold, voluminous one.

3. 100% Pure Fruit Pigmented Ultra Lengthening Mascara: This mascara is colored from black tea, berries, and cocoa. It's a natural mascara that lengthens, separates, thickens, and glosses lashes with fruit pigments and Black tea pigments.

4. Ere Perez Natural Almond Mascara: This is a long-lasting brown mascara made with almond oil to strengthen and lengthen lashes. It's smudge-proof, water-resistant, and suitable for sensitive eyes.

5. Honest Beauty Extreme Length Mascara + Lash Primer: This 2-in-1 mascara and lash primer works together for lush length, volume and definition. It's made without parabens, paraffins, silicones, mineral oil, and synthetic fragrances.

Remember, the best mascara for you depends on your specific needs and preferences. Some people prefer a more dramatic look, while others want something more natural. Always check the ingredients and choose products that align with your clean beauty standards.