At the beginning of both The Hobbit and The Lord of the Rings, Gandalf is described as having “eyebrows that extended beyond the brim of his hat”.
. . .
Also if anyone could get a hold of some pictures that correctly portray his eyebrows, I would be interested in seeing them.
--Finduilas--
Well, these are hardly correct--as they are not of Gandalf but another icon of Northern mythology--but they do suggest how I often imagine that effect could be achieved.