Naturally, Mark's eyes will be light blue in colouring, and his hair will be a light brown which will sometimes look blonde. His eye colour will be inherited from both of his parents. His hair will be lighter than either of his parents', but all of his aunts and uncles will be fair-haired which may explain this fact. He will be capable of altering his appearance to some extent using his desire shapeshifting, but only by mimicking what others find desirable.