Create a photorealistic mockup of a blank greeting card placed on a bed of smooth, naturally textured river stones. The stones should be soft gray to off-white, with subtle color variations and organic shapes. The card should be centered, slightly tilted, and resting naturally among the rocks, casting soft shadows. The scene should have soft, natural lighting, giving it a serene and minimalistic atmosphere, perfect for showcasing designs in an elegant, earthy context. The focus should be sharp on the card, with the stones softly blurred in the background to create depth

Calotype