Illustration of a face resembling the shape of the Chinese character '心' (sim), designed in a minimalistic style. The face structure is simplified to mirror the strokes of the '心' character, with eyes shaped like crescent moons to resemble a gentle, smiling expression, and the mouth drawn as a thin, crescent smile similar to a new moon shape. The design should convey a calm and peaceful expression, capturing the essence of the '心' character in a simple, modern illustration.