The Planning Board is further charged with the duty
of exercising sound judgment to disapprove plans which, in its opinion,
unnecessarily disrupt slopes or result in the unnecessary destruction
of native trees or natural flora or fauna, are not harmonious with
the historical characteristics or structures in the community because
of proposed style, materials, mass, line, color or detail or in relation
to the spaces between structures or the natural character of the landscape
or because the plans do not provide for the design of structures and
open spaces so as to create a balanced and harmonious composition
as a whole and in relation to its several parts and features to each
other.