Even if your face is round, or chubby, you can define your cheekbones using a powder blusher.
1. Use an angled blusher brush and a dark pinkish blusher.
2. Suck in your cheeks, and drag the blusher brush just above the sunken part, up towards your temples in a curved shape as shown in the image below:
3. Blend the powder with your fingers so it gradually gets lighter as it reaches your temples.
4. Use a highlighing powder, smile and use your fingers to smudge it over the top of the apple of your cheek and blend well.