于非闇46岁左右开始画工笔花鸟画，从学清代陈洪绶入手，后学宋、元花鸟画，并着意研究赵佶手法。重古意是于非案的一大特点，他在生命的最后一年，于病中作了一幅《喜鹊柳树》，在题跋中写道:"从五代两宋到陈老莲是我学习传统第一阶段，专学赵佶是第二阶段，自后就我栽花养鸟一些知识从事写生，兼汲取民间画法，但文人画之经营位置亦未尝忽视。如此用功直到今天，深深体会到生活是创作的。

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