1. A computing device, comprising: at least one processor; a first camera having a first field of view; a second camera separated by a distance from the first camera, the second camera having a second field of view that at least partially overlaps the first field of view; and memory including instructions that, when executed by the computing device, cause the computing device to: acquire a first image by the first camera; acquire a second image by the second camera, the first image and the second image being captured over a period of time; analyze the first image to locate a first representation of a head portion; analyze the second image to locate a second representation corresponding to the head portion in the second image; determine, from the first representation and the second representation, at least one of depth or distance information associated with one or more facial features of the head portion; determine the at least one of depth or distance information corresponds to a physical person within a detectable range of the computing device, and not a representation of the physical person; detect changes in a red chroma color component of the head portion relative to at least one other chroma color component or luminance value over the period of time; determine the changes correspond to a signature representative of the physical person, and not a representation of the physical person; and authenticate the head portion as being that of the physical person in response to determining the at least one of depth or distance information corresponds to the physical person and the red chroma color component relative to the at least one other chroma color component or luminance value corresponds to the signature representative of the physical person.