The length of a face from the top of the forehead to the chin is 17 feet.
the width of the phases to feet given that and video Skies T-shirt has a length of 29 inches and a width of 20 in
so, the length of the face must fit the length on the t-shirt
So, the scale will be
so, the drawing scale = 29 inch : 17 feet
feet = 12 inch
so, 29 inch : 17 * 12 inch
so, the drawing scale = 29 : 204
so, the length of face will not above 29 inch
and the width not above 20 inch