The outline of a garment,sometimes called the silhouette.
A light shinning in through a glass, or a car window, or a window! Make sure you add color to make it pop :) You could use a flashlight as well, or the light on a cellphone.
It is important because you want people to buy your product for a reason. you need to know how expensive your product will be to make so you don’t run out of money. and you’ll also need to decide who your product will be intended for to attract sales