Quick sketches

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Here are some of my very fast photoshop sketches. All done with a mouse and no fancy thingy. I made these basically to visualise something from the back of my mind. C&C is always welcome.

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The first and last ones are my favorites. In the first one, is it the back of someone in a spacesuit waving goodbye to a ship? The last one reminds me of something from the game 'Freelancer' for some reason.