You can refer to something that you have done or made yourself as your handiwork .
例句
The architect stepped back to admire his handiwork...設計師后退一步以欣賞自己的作品。While the government said the fire was accidental, residents of the town alleged it was the handiwork of the security forces.雖然政府稱火災是場意外，鎮上的居民卻斷言這是保安部隊的杰作。
英漢詞典釋義
n.
手工, 手工藝(品)
Is this your handiwork?這是你的手工嗎?He stood back to admire his handiwork.他退后幾步欣賞自己的手藝。
結果, 行為
This explosion looks like the handiwork of terrorists.這次爆炸看起來是恐怖分子干的。