A quick, informal drawing or the act of making such a drawing; often a preparatory or observational drawing used in art and design.
電車の窓から見える風景をスケッチした。
I sketched the scenery I could see from the train window.
授業で人物のスケッチを練習した。
We practiced figure sketches in class.
まずスケッチで構図を決めてから本画に入る。
First I decide the composition with a sketch, then start the final painting.