How to increase face cheek muscles?

Here are 3 face exercises for the cheeks:

Keep your lips firmly closed. Suck both Cheeks inward. Hold for a second or two and release. Another way to perform this exercise is by sucking in one cheek at a time.
Keep your mouth closed tightyly. Feel your mouth with air. Hold it under your upper lip for a few seconds and feel the skin on your cheeks stretch. Move the air to your right cheek. Hold. Move the air to your left cheek. Hold. Move the air to your lower lip. Hold. Blow the air out. This is one repetition. You can do 10 or even more if you like
Keep your lips closed. Pucker your lips by using your cheek muscles. Feel the skin tighten and enjoy the exertion. Hold your lips puckered for a few seconds and release.

Hi Arundhati,
You cannot increase face cheek fat as such. You can only tone the muscles by doing some exercises as Manasi told. You need to increase overall fat to increase your face cheeks fat.