Definitely have your eyes looking down at the far end of the runway. Also, the most obvious clue to your height and rate of descent in the flare is actually in your peripheral vision: whilst gazing into the distance, get your brain to pay attention to the overall picture, particularly what's going on at the sides: if you do this you'll get a very clear impression of the ground, hangars, buildings etc. coming up to meet you and will be able to judge the flare much more accurately than if you try to focus on the far end of the runway.
Mark