Whispery sounds are a great way to get a cat's attention.
Put your cat's favorite bed or piece of cat furniture in a place that has good light, get creative with perspective and try shooting from a high angle. Make some whispery sounds, focus on the eyes and be ready to capture their curious expression when they look at up at you. Cats have the most amazing eyes and high angle perspectives are a wonderful way to showcase them.
Don't forget about the background. It is an important element in portraits. Seek out clean backgrounds and colors that compliment your subject. Wood floors can make a beautiful backdrop for a cat portrait.
Camera info: Nikon D3s, 50mm lens, f/4, 1/400s