Cover 18: New Earth

This was a tricky cover to do, the lack of good quality pictures for the main characters/ elements limited what I could do, leading me to use pictures from the Doctor Who Experience, and mocking Cassandra up using a picture from The End of the World and a toy f Cassandra from this story. I will probably be back to redo this one pending feedback, but I want to move on to Tooth and Claw soon because I have a good idea of what I want the cover to look like, if the images are available.