I’m short of time at the time of typing this up so this will be quick.
3 quick and easy tips or a review of 3 quick easy tips:
1) If you want some dramatic lighting, position the sun so your subject’s head eclipses it. Keep in mind that if your subject moves much you can expect to be looking directly at the sun so coordinate carefully.
2) Focus on the eyes. Poets write whole poems about the eyes for a reason.
3) Get down or up to your subject’s level. What level? See number 2 here; eye level.
Bonus tip: a simple background often converts well to grayscale.