In design we make reference
to other drawings, sketches, and plans all the time There is a reason
that designers we all crave tracing paper.
So it is with using Illustrator.
You can import an image into an artwork on its own layer, and then
use it as a template for tracing outlines and fine details accurately.
To trace an image:
Place
the image into an Illustrator document. You will have the most control
over the image if you paste it onto its own layer.
Choose
Window>Show Layers if the layers palette is not visible. The layers
palette is grouped with the swatches palette.
In
the layers palette double click on the image layer to display the Layer
Options dialog box.
Select
the Dim Images option, which makes a given layer appear dimmed on
screen. This option screens back the placed image to make it easier
to edit objects on top of it.