This is a great video of the Thorpedo close-up swimming. Pay special attention to his head position- it’s exactly where it should be. Eyes looking down at the bottom of the pool, part of the back of his head above the surface of the water.
Looking straight forward in freestyle would cause your hips to sink while tucking your chin in too far would cause drag. This is why you need to take the Goldilocks approach and get it “just right”!