contemporary 2D stock illustration, clean simplified natural forms, flat color areas with gentle soft gradient shading, rounded believable proportions, restrained detail, no outer outlines, no texture or grain, non-photorealistic. A clean train car interior with seats along the sides, window panels, overhead rails, and a simple aisle. Calm transit palette with one dominant seat color and neutral structure tones. Keep the center aisle area visually uncluttered with simple forms and open space behind layered foreground subjects. No characters, no text. Ver mais