Well, to be precise in Homer’s writings on Greek mythology, the only descriptions of Helen are:
1. “white-armed” (using the Greek word leukōlenos). So white or pale skinned
2. “lovely-haired” (or eukomos). Homer does not give her hair color
3. Homer does not explicitly mention the color of her eyes, but her gaze is often noted for its striking, god-like effect
Homer underscores her otherworldly beauty by noting that she looks “dreadfully like the immortal goddesses”.
“White-armed” also eludes to her status. No outside (or other labor), so her arms did not get tanned from exposure to the sun.