At six, she's described has having muddy green eyes, a freckly face, and bright red hair.

She found that muddy brown eyes had been replaced by alert blue ones.

The deep-set muddy eyes, and the mouth working as though he were about to spit.

His eyes, muddy and brown, held little sanity in them.

Robbie, her muddy brown eyes fixed on the sky, nodded.

All at once Grace's muddy eyes took on the look of a helpless boy.

He looked around and stared directly into those muddy murderous eyes.

His muddy gray eyes were worried as he watched the two of them ease by him.

Tears ran from his muddy brown eyes behind the round spectacles.

It is also mentioned she has black eyebrows and "muddy" brown eyes.