improve the exterior facade of the existing building and create a high quality photorealistic architectural render use a modern elegant facade design with a clean combination of two grey tones light warm grey as the dominant facade color medium to dark grey as an accent color on selected architectural volumes frames vertical elements or recessed areas keep the color combination subtle balanced and sophisticated avoid very dark charcoal or black tones strictly preserve the existing building geometry proportions openings windows doors balconies roof shape structural elements and overall architectural composition do not add remove or redesign architectural elements improve only the visual appearance of the facade through realistic facade plaster material textures high quality grey color tones natural material variation realistic shadows and ambient occlusion accurate daylight and global illumination realistic glass reflections subtle depth and facade detailing clean and sharp architectural edges realistic surface imperfections professional architectural photography quality use natural daylight soft realistic shadows and a neutral sky the final result should look like a professional high end architectural visualization with realistic materials and natural colors no excessive contrast no artificial hdr effect no grey filter no oversaturation no dramatic changes to the architecture the final image must look modern clean elegant realistic and premium suitable for an architectural presentation
