From the publisher:

Sketches and drawings are the foundations of great art, where thoughts and concepts first come to life as an image. In Sketching from the Imagination: Sci-fi, 50 talented traditional and digital artists showcase their sketches, share their inspirations, and explain their approaches to drawing sci-fi art. From doodles of robots and aliens, to concept designs for spaceships and speculative life-forms, Sketching from the Imagination: Sci-fi is a visually stunning collection packed with useful tips and creative insights – an invaluable resource that will inspire artists of all abilities.