Question

have anyone have ever seen a black hole

Answer 1

No, no one has ever seen Black hole.
The pictures are just made from imagination.

Here's the reason why astronomers have not seen Black hole...

Black holes are born when massive stars collapse in on themselves and create a region of gravity so intense that not even light can escape its grasp. Astronomers also speculate that some black holes may have been formed in the early chaotic universe after the Big Bang.

The biggest problem with trying to see a black hole is that even the supermassive ones (with masses millions of times heavier than our sun) are relatively tiny.

“The largest one in the sky [is] the black hole in the center of the Milky Way,” Dimitrios Psaltis, an astrophysicist at the University of Arizona, explained in an email. “And taking a picture of it would be equivalent to taking a picture of a DVD on the surface of the moon.”

What’s more, because of their strong gravity, black holes tend to be surrounded by other bright matter that makes it hard to see the object itself.

That’s why when hunting for black holes, astronomers don’t usually try for direct observation. Instead, they look for evidence of the effects of a black hole’s gravity and radiation.

“We typically measure the orbits of stars and gas that seem to circle around very dark ‘spots’ in the sky and measure how much mass is there in that dark spot,” Psaltis says. “If we know of no other astrophysical object that can be so massive and so dark as what we just measured, we consider this as very strong evidence that a black hole lies there.”