TRSE How To Draw Tutorials:
Laying Down in 3D.
Step 3 of 5

I have mentioned before about the spaces between
the horizontal lines. The longest arrow represents a lenght of a head that
has been stretched while smaller arrows represnting the lenght of a head
being shrunk.
The horizontal curved lines is used to make the
body seem curvous, and determine the locations of clothes, breasts, and
waist.