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厚涂是油画的雕塑术,用刮刀代替画笔堆砌风景。颜料需调得如奶油般稠厚,直接挤出锡管不稀释,靠腕力压出肌理。画礁石海浪时,先铺深蓝底色,再用灰白颜料叠砌浪尖,刀锋侧推形成飞溅的立体水花。创作老城砖墙更需豪放——赭石混合砂砾厚堆,趁未干时刮出裂痕,干后裂口自然显露底层色彩,沧桑感扑面而来。人物肖像的厚涂精髓在光影:鼻梁高光挑钛白堆成小丘,眼窝深陷处用群青压出凹槽,指尖触摸能感受眉骨起伏。切记“肥盖瘦”铁律:底层颜料多加油薄涂,表层厚堆少油,否则半年后画面龟裂如旱地。
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