  We describe the possible forms of black hole images, viewed by a distant
observer. These images are numerically calculated basing on general relativity
and equations of motion in the Kerr-Newman metric. Black hole image is a
gravitationally lensed image of the black hole event horizon. It may be viewed
as a black spot on the celestial sphere, projected inside the position of
classical black hole shadow. In the nearest future it would be possible to
verify modified gravity theories by observations of astrophysical black holes
with Space Observatory Millimetron.
