The HPPC may call witnesses, including historians, architects, engineers, planning consultants or other experts, and may introduce other evidence at such hearing. In considering any such application, the Commission shall bear in mind the purpose of this section and shall give consideration to any report of local historical societies and advice of the Village Historian relating to the general design, arrangement, architectural style, texture, material and colors of the building or structures in question, the location on the plot of ground and the relation of such features to other buildings, structures, trees or other forms of growth, landmarks, public or private roads and all other such factors pertaining to the renovation, installation or conservation of any building or improvement which would be obviously incongruous with the historic aspects of the surrounding area.