1. A computer-implemented method comprising: receiving an image of a facial region of a user, the facial region including an eye and an area surrounding the eye; defining an ocular image region including at least a portion of the eye in the image of the facial region; defining one or more periocular image regions each including at least a portion of the area surrounding the eye in the image of the facial region; identifying a plurality of points of interest in at least one of the ocular image region and the one or more periocular image regions; calculating, for each point of interest, a region value for texture surrounding the point of interest; and determining at least one quality metric for at least a portion of the image of the facial region based on the points of interest and the respective calculated region values.