Example methods disclosed herein include overlaying a semi-transparent version of a reference image over a sequence of captured images as respective ones of the captured images are displayed on a display of a portable device. Such disclosed example methods also include determining a directional difference between a first one of the captured images and the reference image. Such disclosed example methods further include presenting a directional prompt to indicate a direction to move the portable device to cause a subsequent second one of the captured images to coincide with the reference image.