Think of your body as a seesaw. When one side goes up the other side goes down. Lifting your head to high will cause your hips and legs to sink.
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What position should your head be in? Anywhere from a straight neck position to slightly looking forward position. This will depend on the buoyancy of your body. If your body floats really well with legs near the top of the water then you can get away with bending your neck slightly and looking slightly forward but you can also keep your neck straight if that is comfortable for you. If your legs sink low in the water then you should keep your neck straight and look down.
There are other factors that will affect your body position in the water while swimming freestyle. Stay posted for further articles.
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