What happened to Harry Porterie's dark sign?

In the ninth chapter of the fourth Harry Potter and the Goblet of Fire, the dark mark first appeared, and there was a description of the dark mark at that time:

At first, Harry thought it was a figure made up of goblins, but later, he found it was a huge skeleton made up of countless bright green stars. A boa constrictor emerged from the skull like a tongue. As they watched, the skeleton rose higher and higher, shining in a mass of green smoke, like a new constellation against the dark night sky.

So the snake smoke is actually a part of the dark mark ~