Male, 21. What would you recommend to improve overall facial look? (Photos)

At least from the photo provided, it would appear, primarily in front face view, that there is a slight volume deficit in the central cheek area around the nose that is interrupting a smooth transition between the lower eyelid region and the upper cheeks. The finesseful use of a robust HA volumizing filler can establish the necessary smooth transition. You would be wise to consult with an experienced, board certified cosmetic dermatologist filler injection expert, since it is very important for the treatment to be done so as to maintain a masculine face and not to feminize it by adding too much filler to the outer cheeks. Hope this helps and best of luck.

At 21, one of the biggest advantages you have is that your skin and facial tissues are still youthful. Rather than trying to make dramatic changes, I would focus on enhancing your natural features and maintaining good skin health.

From your photos, your face appears well-balanced overall. If your goal is simply to look more refreshed or more defined, here are the areas I would consider:

Skin quality: Healthy, even-toned skin has one of the greatest impacts on overall attractiveness. A consistent skincare routine with sunscreen, a gentle cleanser, moisturizer, and a nighttime retinoid (if appropriate) can improve texture and prevent premature aging. If acne or acne scars are present, treating those often provides a noticeable improvement.
Jawline definition: If you have a little fullness under the chin despite being lean, improving body composition can sometimes sharpen the jawline naturally. In select cases, non-surgical contouring treatments can help, but I would be conservative at your age.
Facial symmetry: Perfect symmetry doesn't exist, and the small differences that most people notice about themselves are usually not obvious to others. I would avoid chasing perfection with multiple cosmetic procedures.
Hair and grooming: A hairstyle that complements your face shape, well-maintained eyebrows, and facial hair (if you grow it) can make a surprisingly significant difference in your overall appearance.
Lip and nose proportions: Your profile appears harmonious. I would not recommend altering these features unless there is a specific concern that truly bothers you.

At your age, I would not rush into filler or other injectable treatments unless there is a very specific structural issue. Starting cosmetic procedures too early can sometimes create an unnatural appearance over time if treatments become excessive.

My recommendation would be to invest first in:

Consistent skincare.
Daily sunscreen.
A healthy diet and regular exercise.
Good sleep and hydration.

These habits often have a greater long-term impact than cosmetic procedures alone.

Overall, I think you already have a strong foundation. If you're looking to improve your appearance, subtle refinement and maintaining healthy skin will likely give you the most natural and lasting results rather than making major changes.