Hair colour is only one indicator of redheadedness, just as some black bears are brown.
A ruddy beard is not sufficient. However, hair on the head in an approved shade, plus brows, lashes, and facial hair of the same or related shades, are sufficient. The skin may seem as if vacuum-packed in plastic. Eyelids may be puffy-looking. Eyes tend toward blue, though brown eyes don't disqualify you, and genuinely green eyes, as bright and almost as tangible as the dyed cherries you find in a supermarket , confer bonus points.