add a short black steel railing along the limestone capped edges of the rooftop patios in this image the railing is a slim modern guardrail thin black steel with closely spaced vertical balusters and a simple top rail low in height matte black finish mounted on top of the existing light limestone parapet caps that edge the open rooftop terraces apply the railing along the limestone capped patio edges on both rows of buildings following each capped edge in correct perspective consistently on all the rooftop patios visible near and far mount it on top of the limestone caps where they border the open rooftop patio space do not add railing to the tops of the solid dark stair enclosure penthouse volumes only along the limestone capped open patio edges do not change anything else keep the buildings architecture dark brick the limestone caps themselves windows doors garage doors the central paved drive landscaping the rooftop volumes massing and the camera angle perspective and framing exactly as they are only add the railings match the existing dusk lighting warm wall and landscape lights sun direction and mood already in the image with the new railings casting soft consistent shadows in the same direction render the railings photorealistically real thin black steel correctly scaled with believable contact shadows where they meet the limestone so they look like part of the original photograph avoid oversaturation flat lighting and plastic cgi smoothness
