Definition of «rough sketch»

A "rough sketch" refers to a quick and simple drawing or outline that gives a basic idea or plan of something, without much detail or precision.

So far we have only a very rough sketch of what he's planning to do. (us.beyondbullsandbears.com)
Depending on the complexity of the page, a completed work can take three days to a week to complete from rough sketches. (wolfsgamingblog.com)
There is also an «image board», consisting of panels with rough sketches. (metalgearinformer.com)
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