A delicate watercolor illustration of a cozy treehouse library at sunset. The treehouse is built into an ancient oak tree with thick gnarled branches, small warm yellow windows glowing with candlelight, a rope ladder hanging down. Books visible on shelves through the windows. A small owl perched on the roof reading a tiny book. Surrounding the tree: a wildflower meadow with lavender, daisies, and poppies in bloom. A winding cobblestone path leads to the base of the tree. Butterflies and fireflies in the air. The sky is a watercolor wash of warm pink, orange, and soft purple with wispy clouds. Style: traditional watercolor on cold-pressed paper, visible brush strokes, wet-on-wet technique with soft color bleeding at edges, white paper showing through as highlights, no black outlines, gentle and whimsical. Artistic quality of Beatrix Potter meets Studio Ghibli backgrounds.