Digital Mattepainting Assignment 3

During the assignment, we had to create a scene based on a short story created by ourselves

"An Alien invasion had taken place in europe half a decade ago.
The whole area has been vacated for a while after a military confrontation with the Aliens.
What is left is a derelict street, damaged.
The Aliens have constructed a portal beam to their planet.
Now humans have to stop it."