An applicator head is provided for a reflectance modifying agent (RMA) applicator is moved across the skin by means of a floating ring having dispersed raised contact points to maintain a proper distance from the surface to be treated, reduce the influence of outside light during scanning, and limit smudging during deposition. During an application session, software on the computer uses a camera to sense aspects of color and texture on human features, calculates cosmetic enhancements, and uses the printer head to apply RMA precisely to the features to create those enhancements. Skin landmarks are used for registration. The head uses differential lighting by providing a sequence of directional lighting, with some exposures left dark to adjust for ambient light leakage. The exposures are co-synchronized in stacks, where each stack is a grouping of data about a particular instant of time during the scanning.
