add one small decorative spherical metal finial to the free end of the existing handrail use the provided reference image only as inspiration for the traditional character of the finial the finial must be small and perfectly or almost perfectly spherical subtle and elegant proportionally matched to the slender handrail made of the same black satin matt metal as the existing railing seamlessly connected to the very end of the existing handrail do not copy the large ornamental finial from the reference image only use its traditional character as inspiration absolutely nothing else may be changed do not alter the railing geometry handrail trajectory curvature posts spacing stairs building facade windows door materials lighting shadows camera perspective or composition do not add or remove any other elements only add the small black metal sphere to the free end of the existing handrail
