Start with the right ingredients
No white should appear on top of the coffee yet. Continue to pour slowly until the cup is about a third full.
By bringing the pitcher down closer to the coffee and pouring a bit faster, you'll be able to start coaxing the foam that will create your design out of the back of your pitcher. You should see a dot of white start forming on the top of the coffee at this point, and it should expand outward as you pour more.