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Школьный плакат «THE RIVER'S QUIET FILTER»: пресноводный моллюск с фото 1 на дне реки с фото 2

Create a finished portrait-format children’s science classroom poster for ages 8–11 titled exactly “THE RIVER’S QUIET FILTER”. Meaningfully synthesize both supplied references into one cohesive educational illustration rather than a collage: preserve the eastern elliptio’s distinctive elongated shell silhouette, olive-brown concentric growth rings and amber edge coloration from reference image 1, and reconstruct the recognizable gravel arrangement, submerged stones, waterweed, clear current and dappled green light of reference image 2 as the surrounding river habitat. Use a warm, tactile editorial art direction combining opaque gouache, colored pencil texture and crisp screen-printed shapes on lightly speckled cream paper. Palette: river green, mineral blue, warm ochre, clay red, charcoal and cream. Friendly and curious rather than cartoonish; scientifically accurate proportions, no face or human personality added to the animal. Poster composition: generous cream border and a strong vertical reading path. At the top, set the exact title “THE RIVER’S QUIET FILTER” in large hand-lettered charcoal capitals, followed by the smaller exact subtitle “How a freshwater mussel helps keep water clear”. Below, show the referenced river as a beautiful cutaway scene crossing the waterline and riverbed. Place one large eastern elliptio partly nestled into the gravel as the central subject. Open a clean educational cutaway window through one side of its shell while retaining the recognizable exterior shell around it. Clearly depict the mantle, gills, muscular foot, incurrent siphon and excurrent siphon with simplified but anatomically credible forms. Use restrained blue arrows to show water entering through the incurrent siphon, passing across the gills and leaving through the excurrent siphon. Show a few suspended particles moving with the incoming water and fewer particles in the outgoing water; do not imply perfectly purified or sterile water. Connect five short leader lines to exact, legible labels: “INCURRENT SIPHON”, “GILLS”, “MANTLE”, “MUSCULAR FOOT”, and “EXCURRENT SIPHON”. Add a small three-frame visual sequence along the bottom labeled exactly “1 WATER FLOWS IN”, “2 GILLS TRAP TINY PARTICLES”, and “3 WATER FLOWS OUT”. Each frame should use the same mussel anatomy and arrow logic as the main diagram. Include one compact fact box with the exact heading “WHY MUSSELS MATTER” and the exact two-line copy “They recycle nutrients and create habitat for other river life. Clean, connected rivers help mussels survive.” Keep all wording highly legible, correctly spelled and suitable for elementary science education. Maintain clear hierarchy and ample negative space so the poster can be read from a classroom wall. No logo, no brand, no additional text, no decorative border, no photorealistic pasted elements, no fantasy glow, no extra animals, no anthropomorphic features and no UI or mockup presentation. Deliver the standalone print-ready illustration filling the canvas.