modify the existing visualization to reflect a subtle early autumn season while preserving the original daytime lighting and clear blue sky keep the overall weather shadows and illumination unchanged the transition to autumn should be gentle only some deciduous trees should show partially yellowing leaves while most greenery remains intact conifer trees such as pines and spruces must stay fully green grass should remain fresh and green with only minimal seasonal change add a light scattering of fallen yellow leaves on sidewalks and ground areas for a realistic autumn touch maintain the original composition architecture and lighting style without dramatic environmental changes the final result should feel like a calm sunny day in early autumn with subtle seasonal hints rather than a full seasonal transformation
