A scientific botanical-style cross-section illustration of a human heart revealing intricate cardiac chamber architecture, valve leaflets, papillary muscle attachments, coronary artery distribution, and fibrous pericardial layers on aged cream paper, handwritten anatomical annotations describing each cardiovascular structure, measurement scale in centimeters along the edge, soft natural daylight from upper left casting delicate shadows, museum archive quality, Pantone-accurate deep crimson myocardium with ivory valve tissue and warm rose arterial highlights, composition centered to showcase the four-chambered pump architecture, mood: anatomical precision capturing vital organ wonder, hyperrealistic details of trabecular muscle textures and chordae tendineae filaments visible