Mars explorer by Erik van Helvoirt

Picture of the Day 21/3/15 - Mars exploration rover by Erik van Helvoirt from Netherlands. More of his concept art here.

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Mars explorer by Dmitry Kolomeets

Picture of the Day 6/3/15 - Mars exploration rover (2014) by freelance digital artist Dmitry Kolomeets (Dimk). More of his art here.

Astronauts exploring Mars by Manchu

Picture of the Day 14/2/15 - "Sunrise on Mars polar cap" by French sci-fi artist Manchu (Philippe Bouchet).

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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Mars trucks by Bryan Versteeg

Picture of the Day 3/1/15 - Mars exploration vehicles by Bryan Versteeg. More of his space concept art here.

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:

Astronauts exploring Mars by Sean Brady

Picture of the Day 27/4/14 - "Olympos station" (2007) by Sean Brady from United Kingdom.
Author's description of the scene: Setting up an automated weather station on the lower slopes of Olympus Mons.

Mars rover by Walter Myers

Picture of the Day 13/4/14 - Mars exploration rover by sci-fi artist Walter Myers. Watch more of his art here.