PattyOD

Hi there! I am trying to import a picture of a bourbon barrel head (circle) with a transparent background into Chief putting it on a 3D solid poly line 22" in diameter. I am selecting shrink to fit but when i spray it on the 22" polyline the barrel head is showing up more like 10" diameter and I cannot get it to fill the full ppolyline. Can you please provide some guidance on what I am doing incorrectly? Thanks much.