If you are looking for a good natural mascara, take a look at Korres Deep Colour Mascara. This standard black mascara has a fairly big brush with a good tapered end.
According to the company literature, Korres mascara contains Provitamin B5 for conditioning and strengthening lashes and Rice Bran, which expands to provide length, volume, and fullness. It also is free of Parabens, Sulfates, Mineral Oils, Petro-chemicals, Propylene Glycols, Ethanolomines, GMOs, Synthetic Fragrances and Synthetic Dye.
The mascara worked wonderfully for me. I had no clumps whatsoever, even when rushing and not wiping the brush carefully. The product lengthens and defines quite nicely. I got more length than volume out of it. It wore well all day and simply looked great.