Not all that good a picture, though
Not all that good a picture, though
Just to give us something to go on, here's the description given of Tom Bombadil in FOTR:
...there appeared above the reeds an old battered hat with a tall crown and a long blue feather stuck in the band. With another hop and a bound there came into view a man, or so it seemed. At any rate he was too large and heavy for a hobbit, if not quite tall enough for one of the Big People, though he made noise enough for one, stumping along with great yellow boots on his thick legs, and charging through grass and rushes like a cow going down to drink. He had a blue coat and a long brown beard; his eyes were blue and bright, and his face was red as a ripe apple, but creased into a hundred wrinkles of laughter.