  We study here images of thin accretion disks around black holes and two
classes of naked singularity spacetimes and compare these scenarios. The naked
singularity models which have photon spheres have single accretion disk with
its inner edge lying outside the photon sphere. The images and shadows created
by these models mimic those of black holes. It follows, therefore, that further
and more detailed analysis of the images and shadows structure in such case is
needed to confirm or otherwise the existence of an event horizon for the
compact objects such as the galactic centers. However, naked singularity models
which do not have any photon spheres can have either double disks or a single
disk extending up to the singularity. The images obtained from such models
significantly differ from those of black holes. Moreover, the images of the two
classes of naked singularities in this latter case, differ also from one
another, thereby allowing them to be distinguish from one another through the
observation of the images.
