Here is the 3 Aliens piece so far, I added a catwalk in the upper section of the doorway to fill out the space above the large aliens head.
During my last session I voiced my annoyance with the guy in the bottom left of the picture and it was agreed to give him a more dynamic and alert substance to his pose as he looked a little static and not really responding to the scene unfolding in the doorway.
The image is not completely done yet as I still have a fair few areas to refine but I am happy with it so far.

Here I did some quick colour roughs of a type of tram station, that utilises high speed transports for shipping the prisoners to the different sectors of the prison.
Although I liked the concept It was pointed out it focused to much on the environment and did not show much of anything regarding the prisoners.

My second idea borrowed from the first by having the aliens being roughly shunted through the main entrance to the prison.
The main changes consisted of making the doorway a much more interesting shape and allowing for a grate number of vastly different shaped aliens to pass through its foreboding archways.
I completely dropped the idea of the trams at least for this image, to better focus the attention on the aliens and guards in the scene.
In the background you can see I brought back an idea I drew up previously of the shuttle that had dropped off the prisoners which is now blasting off back to the space stations in orbit.

After going over my designs again I am beginning to have second thoughts about the Protagonist alien I'm not satisfied with my current design for him.
My vision of this character is a mysterious and shady character who is helping the human protagonist for unknown reasons after aiding him through the complex after the corruption has taken most of the Prison.

Upon finally meeting the mysterious alien the human is shocked to find out he was being aided by prisoner who has somehow escaped from his prison and taken over the control room on Deck A4050.

I am yet undecided if this should be the VIP prisoner instead the main threat I had originally planned.
The threat could possibly be a largely unknown entity developed within the bowls of the prison by the Head Warden's personal scientists.
Somehow this VIP prisoner is connected to with Head Warden and the strange experiments being conducted in the bowls of the Prisons inner sanctums.