By now we've all seen the 3D incarnation of Darth Vader in one form or another, and I have glanced at some early version of Han before. But this is the real, finished thing. Not that he usually is, but you never know. As for Han, he looks very debonair and is portrayed in stunning detail, right down to the scar on his chin. And Jabba never looked this good, even in his young years.
Every icon is made up of various elements.
As you've probably noticed, the jewel used in the Vader icon is red. You'll see later that the jewel used for Tarkin is blue and the one for Han is green, while the icons for both Jabba and Luke are based on a yellow jewel. At this point the Luke icon is not completed, so I can't comment on it. But the other four look fantastic. In real life, you can take a very good looking model and take pictures that come out looking quite bad, because the lighting wasn't right, the camera work wasn't done properly, and so on.