(Bottom)
 this image was some concept sketches for the main protagonist of the story a telepathic semi aquatic native of the planet the prison is situated. His species is heavily despised by the local humans due to a wave of xenophobia that has swept throughout the colonies and as such his race suffer greatly at the hands of the prison guards especially when those hands happen to belong to the head warden.

(Top)
I created a more refined image of the top right concept in the previous image as it fitted best with what I was looking for in my protagonist alien.
It was very important that out of all my aliens this guy has to vaguely resemble a human at least emotionally more than any other alien character but still remain quite alien at the same time. I found that by removing his mouth and focusing on his eyes and brow line I can still give this guy some powerful emotional expressions to guide the viewer visually through this guys story.
I will develop this guy further to breath some life and character into him and to also refine the design to enhance the visual interest as I feel he is looking a bit plain at the moment.