The photo requirements differ by style. à la Silhouette is a solo portrait style whose upload tips ask for a side-on photograph with good lighting and a clear outline. For a couple, The Chapel asks for both faces to be visible and accepts a photo together or separate photographs of each person.
For a group, start with Renaissance and review its upload options. Compare the example on the individual style page before choosing your photographs; a profile portrait and a couple portrait ask for different references. Browse pet portraits for the separate pet collection, or see Pricing for current purchase options.