Create a whimsical illustration with a man and woman in simple, childlike figures jumping to high-five each other energetically. Use bold, flat colors and shapes with a hand-painted texture. The figures should have oversized heads, stick-like limbs, and expressive faces with large, friendly eyes. Emphasize joy and affection in their posture. The background should be a simple heart shape or a similarly straightforward design, using a palette of primary and pastel colors. The overall feel should be cheerful, innocent, and uncomplicated, reminiscent of a children's book illustration.