1. A system to change an appearance of a region of skin of a person, the system comprising: at least one reflectance modifying agent application element, the reflectance modifying agent application element being operable to apply one or more reflectance modifying agents to frexels of the skin of the person; and a computing device in communication with the at least one reflectance modifying agent application element, the computing device being operable to perform operations comprising: receiving a desired image associated with the region of the skin, the desired image depicting one or more model features of skin, receiving a first image depicting features of the region of the skin, the features being associated with a current appearance of the region of the skin, comparing the desired image to the first image to determine a difference between a plurality of frexels within the first image and the desired image, and providing the difference between the plurality of frexels, to the at least one reflectance modifying agent application element to apply the reflectance modifying agents to at least one of the plurality of frexels based on the difference, the reflectance modifying agents being applied to emulate the one or more model features of the desired image within the region of the skin of the person.