When designing curtains with the eye of an interior stylist, consider factors such as fabric choice, color, length, and overall aesthetic. Opt for quality fabrics that drape well and complement the room's decor. Choose colors that enhance the space, whether by adding a pop of color or blending seamlessly with the existing palette. Additionally, consider the length and fullness of the curtains to create a sense of luxury and elegance. Balance natural light and privacy needs, and ensure the design aligns with the overall style and ambiance of the room.