Step 2: Draw a Circular Selection
Hold down the Shift key and draw a selection around the face. The Shift key will make sure that the selection always stays circular. If you’re using Rectangular Marquee tool, holding down the Shift key will keep the selection square.
Right now, you don’t need to worry about the center of the circle. We’ll adjust it in the next step.
Step 3: Adjust the Center of the Selection
Now move your mouse to the inside of the circle. You will notice that the cursor changes. This shows that you can move your selection.
Now place the circle in a place which suits you. The area inside the circle will be the area which remains once the cropping is done.