插画底图英语怎么说

插画底图一般称作"sketch"，来源于英语中的"sketch"，意为"素描，草图"。
例句1:
The artist started with a rough sketch of the landscape before painting.
（艺术家在绘画之前，先画了一张山水的素描。）
例句2:
I like to work from sketches, it helps me to get a better understanding of the composition.
（我喜欢从素描入手，这有助于我更好地理解构图。）
例句3:
The designer created a series of rough sketches for the new logo before finalizing the design.
（设计师为新标志创作了一系列粗略的草图，然后才最终确定了设计。）