Boy on Mars messaging his dad (image from The Expanse season 3)

Picture of the Day 29/6/2018 - Alex receiving a video message from his son on Mars - image from episode 6, season 3 of The Expanse sci-fi TV series. Images of Mars from season 2 of the series here.

Vintage poster "Expedition Mars" by Kip Ayers

Vintage style poster "Expedition Mars" featuring a family exploring Martian landscapes by freelance illustrator Kip Ayers.
More of his illustrations here.

Elon future on Mars by Victor Hegger

Possible future on Mars inspired by Elon Musk - a drawing by Dutch comic artist Victor Hegger. More of his art here.

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Terraforming Mars by Stefan Morrell, National Geographic

Gradual terraformation of Mars by concept artist Stefan Morrell from New Zealand. His picture was used to illustrate Robert Kunzig's article about terraforming Mars in National Geographic Magazine, February 2010 issue, and many more articles about colonization and terraformation of Mars since then.

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Close-up of the central section:

"Making Mars the new Earth" by Robert Kunzig, National Geographic Magazine, February 2010:

Landing burn of SpaceX BFR spaceship

Picture of the Day 20/6/2018 - Landing burn of SpaceX Big Falcon Rocket (BFR) spaceship (BFS) by British digital artist Charlie Burgess. More of his art here.

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Marines on Mars - images from Space: Above and Beyond (1995) TV series

Space: Above and Beyond (1995-1996) is a one season sci-fi TV show set in the years 2063-2064 and depicting humanity's fight against an alien race attacking the first extra-solar human colony. The show focuses on a squadron of US Marine Corps space cavalry. A small part in the first episode takes place on Mars and here are some images from that part:

SpaceX BFR spaceship docking to Bigelow orbital station

Picture of the Day 11/6/2018 - SpaceX Big Falcon Rocket (BFR) spaceship (BFS) docking to Bigelow orbital space station consisting of three B330 inflatable modules; fan vision by Reddit user brickmack (Mack Crawford). More of his space concept art here.

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Astronauts watching a spaceship landing on Mars by Stephen Youll

Picture of the Day 10/6/2018 - astronauts watching a spaceship landing near a canyon on Mars - a cover image by Stephen Youll for Gregory Benford's book "The Martian Race" (1999).

SpaceX BFR spaceship on Mars at evening

Picture of the Day 6/6/2018 - SpaceX Big Falcon Rocket (BFR) spaceship (BFS) on Mars at evening; fan vision by Instagram user astro_kerman from Kerbal Space Program rocket simulation game with Tundra Exploration Mod.

Cutaway diagram of SpaceX Big Falcon Ship

Unofficial cutaway diagram of the 2nd stage of SpaceX's Big Falcon Rocket (BFR) - Big Falcon Ship/Spaceship (BFS) - by Nick Oberg. Size comparison with Space Shuttle, Boeing 737, Apollo CSM/LM and Tesla Roadster in the lower left corner.

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Original resolution (8.7MB) diagram here.

More speculative internal layouts of Starship by SpaceX fans:

• Starship interior concept for 20 to 40 passengers by Paul King + VR tour
• Starship interior concept for 100 passengers by Joseph Lantz
• Animation of Starship interior concept by DeepSpaceCourier
• Cutaway schematic of Starship interior by Tom Dixon & Austin Barnard [not speculative]
• Starship interior concept for 64 passengers by Erik Corshammar & smallstars
• Cutaway diagram of Lunar Starship by Rocket Posters
• Starship interior concept for 100 passengers by Rick Kiessig & Michel Lamontagne
• Starship interior concept by Jim Murphy
• Speculative internal structure of Starship by William Falconer-Beach
• Speculative internal layout of Starship by Michel Lamontagne
• Cutaway diagram of Starship by Julian Schindler

Occupy Mars - simulation game about Mars colonization

Occupy Mars is an upcoming (as of today: TBD 2018) highly technical open world simulation game about Mars colonization from Polish indie game developer Pyramid Games. In the game you will be able to "build and upgrade your base, discover new amazing regions, conduct mining operations, retrieve water and generate oxygen, grow crops, fix broken parts, learn how to survive on Mars!"

Here are some promo images, posters and a trailer from the developer. Note the SpaceX style spacesuit and ITS 2016 spaceship(s) near the base.