As a redhead who is also an esthetician, I would tell you that a cooler color looks better, especially against pink-toned skin like ours. A true red brow looks fake...and too dark/intense for our pale skin. Very rarely is anyone’s brow color an exact match to their hair color, no matter what color their hair is. So your taupe or even a neutral to slightly golden light brown looks best. Or, as Papertiger suggested, adding a few LIGHT pencils strokes of auburn to a taupe brow would work if you aren’t a fan of the taupe brow. If taupe does not look right to you, your shade may be too cool (grayed out) and you may need a warmer (camel-ish or caramel) shade. You may need to experiment with different shades and different brands to get different undertones...makeup for redheads is a balancing act between warm and cool to compliment both the warmth of our hair color and the coolness of our skin tone.
You could also try a lighter, taupe-ish pencil color topped with a brow gel in a warmer color for definition. And never forget to brush and blend your pencil, no matter what color you use.