After talking to Justin, it has been decided that Alien's body would be based on the below right image. This was based on an idea that I had which to experiment with different insect parts and mircroscopic creatures together on Photoshop and see what Alien structure I can make out of it. It was quite fun exploring around different images and overlaying them . These are all the thumbs that I made out of from the experiment.
|(Right: The chosen Alien body shape)|
And here are the images that I played around with on Photoshop to get these Alien ideas.