1. A method comprising: receiving, from an image capture device coupled to a computing device, a first image of a face of a user, and a second image of the face of the user; detecting a liveness gesture based on at least one of a yaw angle of the second image relative to the first image and a pitch angle of the second image relative to the first image, wherein the yaw angle corresponds to a transition centered around a vertical axis, and wherein the pitch angle corresponds to a transition centered around a horizontal axis; generating a liveness score based on at least one of a yaw angle magnitude associated with the yaw angle and a pitch angle magnitude associated with the pitch angle; comparing the liveness score to a threshold value; and determining, based at least in part on the comparison, whether to deny authentication to the user with respect to accessing one or more functionalities controlled by the computing device.