In reviewing an application, a commission shall: use the guidelines adopted under § 8–301 of this subtitle; and consider: the historic, archaeological, or architectural significance of the site or structure and its relationship to the historic, archaeological, or architectural significance of the surrounding area; the relationship of the exterior architectural features of the structure to the remainder of the structure and to the surrounding area; the general compatibility of exterior design, scale, proportion, arrangement, texture, and materials proposed to be used; and any other factors, including aesthetics, that the commission considers pertinent. A commission shall consider only the exterior features of a structure.