The art of faux finishing begins when applying the second coat. This is the glaze coat. This coat is applied only to a small area each time. You paint a bit with a brush, and than you play with the paint on the wall with an application device. This device can be a sponge, brush, comb, rag, or anything the artist wishes to use. Each application technique will create a different effect of faux finishing.
Now it is up to your taste as a customer, on how you would like your space to look and feel.