Mars greenhouse by Robert Murray

Picture of the Day 18/4/15 - Mars greenhouse by Robert Murray / The Mars Society.

Astronauts exploring Mars by Kyle Brown

Picture of the Day 7/2/15 - Astronauts trying to find a lost Mars rover by American concept artist Kyle Brown. More of his art here.

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Lone astronaut on Mars by Alberto Vangelista

Picture of the Day 28/1/15 - A lone explorer on Mars by Italian digital artist Alberto Vangelista. More of his art here.

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Setting up a Mars base by Pat Rawlings

Picture of the Day 8/5/14 - Setting up a Mars base (1998) by space illustrator Pat Rawlings.

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Marker sketches of Mars by Phil Smith

Mars related marker sketches (2005-2006) by American artist Phil Smith. More of his art here.

Most of these sketches was made for Mars Foundation - an organisation whose mission is to inspire the next generation of Mars explorers. They run several research projects (as 3D printing on Mars) to design, fund, build and operate the first permanent settlement on Mars (Mars Homestead Project). Click to view in full resolution:

Mars greenhouse by Les Bossinas

Picture of the Day 22/4/14 - Mars greenhouse (1991) by NASA's concept artist Les Bossinas.

Astronauts exploring Mars by Ren Wicks

Picture of the Day 15/4/14 - A classic work "Mars mission" (1990) by American artist Ren Wicks. More of his Mars art here.

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Astronaut working on Mars by unknown artist

Picture of the Day 10/4/14 - Can anyone point me out the author of this Mars artwork? Leave in comments...

Mars base by Georgi Petrov

Picture of the Day 8/4/14 - A Mars base by architect Georgi Petrov.

Astronauts exploring Valles Marineris by Sean Brady

Picture of the Day 7/4/14 - Exploration of Valles Marineris (2009) by Sean Brady from United Kingdom.