Why must an artist hide all fasteners when they display fashion on a mannequin? 1) to make people think that the garment will stick to their skin

2) to give an artist's assistant something to do

3) to ensure that the viewer is not distracted from the piece

4)to make sure the mannequin does not fall over

To create an illustration of perspective, this artist did all of the following except 1) show clear orthogonal lines 2) have an implied vanishing point 3) distort proportion to keep the background and foreground the same size 4) include value changes between the foreground and background i was thinking maybe 1