An image processing method includes printing out a layout mark-sensing sheet indicating a plurality of different sample image layout options that graphically indicate different layouts of an image to be printed on a recording medium that has a specific shape. The layout mark-sensing sheet allows a user to mark the layout mark-sensing sheet to designate a specific image layout option from among the plurality of different sample image layout options. The layout mark-sensing sheet marked by the user is read and the image is printed on the recording medium based on the specific image layout option marked by the user on the layout mark-sensing sheet.