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watercolor painting red maple leaves branches autumn fall nature art illustration background design element decoration ornament border frame pattern texture brushstroke stroke line shape form color hue tint shade tone saturation brightness contrast light dark shadow highlight reflection translucency opacity transparency watercolor paper rice paper vellum canvas board panel surface medium tool brush ink pigment dye stain glaze varnish fixative technique method process step instruction guide tutorial tip trick secret 诀窍 窍门 方法 步骤 指南 教程 提示 技巧 秘密