The "Beast In The Cage," picture generally shows a big monster inside a big cage and warrior like people standing around the cage with weapons in their arms. The monster represents the Liberalist and they in favor of their new ideas but the conservatives, the people standing outside the cage represent Austria, Russia, Prussia, and France. They don't want the liberals to start to spread ideas; they trap the monster inside the cage to prevent the liberalist to start spreading their ideas to everyone.
The monster is in the cage in the first place because people were tired of being pushed around and tired of paying taxes when the upper class and the king didn't have to, also they hated to be looked down upon. So all of this led them to rebel. Everything started in the middle class because they were the most educated and knew what was going on more clearly. The Congress Of Vienna is when the conservatives first started to meet after the French Revolution. They wanted to talk about how to rebuild France and return things as it was before the revolution. .
About the picture the monster in the cage represents liberalism, hence the "L" on its hat and stomach. The liberals wanted the government to be based on written constitutions and separation of powers. They wanted to defend the natural rights of individuals to liberty, equality, and property. The beast is bending the bars because the third estate has 97% of the population and the more support they got and the more people who joined, they got stronger and powerful the liberals got, the conservatives couldn't hold them back anymore, so the liberals just started to bust through. The liberal kept on gaining more power and the conservatives were getting more and more worried. Each of the four people standing in front of the cage represents Austria, Russia, Prussia, and France. Those countries are the most powerful counties in Europe and they are trying to get rid of the liberals.