Most Helpful Guy
Physical feminine beauty is very complex, but I think you could focus on 3 things and do quite well: Skin, hair, and eyes.
Skin - Exfoliates, lotions, hydrating creams, oils, etc to keep it clean, clear, and vibrant. At your age, you may have some skin issues, but that's ok because it's temporary.
Hair - Conditioners, silkers, scalp therapy oils (like Biosilk), etc to keep it clean and healthy, combing/brushing to keep it free of tangles.
Eyes - Not much you can do to change your eyes without makeup, but if they're red or irritated, try some vitalizing drops to brighten them.
Apart from this, learn to be confident in your natural beauty. That's what will really make you beautiful. Good luck!
Most Helpful Girl
In my opinion these are the best ways to enhance your beauty and look healthy and natural:
1. Wear a luminous bb cream or lightweight foundation
2. Wear a shimmery beige or bronze cream eyeshadow
3. Wear a good quality mascara
4. Wear some lip tint and apply lip balm over it
Cream products are the best for making you look natural and healthy, if you have any other questions or want more ideas, there are a lot of good youtube videos about natural makeup