Astronaut relaxing near a SpaceX Starship spaceport

Picture of the Day 30/03/2021 - Astronaut leaning against his Mars rover derived from a retro car near a SpaceX Starship spaceport by American video game concept artist Darren Bacon in collaboration with parody account Bored Elon.

СССР-2061 - a retrofuturistic vision of Soviet Union on Mars

Project "СССР-2061" is a community of Russian artists and writers envisioning Soviet Union in 2061 in an alternate reality. In 2011 they held their 1st arts contest asking participants to envision Soviet Union on Mars 50 years into the future. Here are some of the artworks from the contest.

Soviet spaceport in Valles Marineris on Mars by Igor Savin:

Domed soviet colony on Mars by Grinya Lesnoy:

Spaceport on Phobos by Thomas Peters

Picture of the Day 12/02/2021 - Spaceport on Phobos, the closest of two natural Martian moons, by graphic designer and illustrator Thomas Peters (Drell-7). More of his space art here.

Orcus Patera base on Mars from Orbiter space flight simulator

Orbiter is a free-to-play space flight simulator developed by a single man Martin Schweiger since 2000 (the last major update was on 2016) and using realistic physics. Originally it's a very bare-bones program, but has a lot of fan-made addons which make the simulator much more enjoyable. One of those addons is Orcus Patera - a fictional human base/spaceport located in Orcus Patera depression on Mars; the addon is developed by Well and DanSteph.

Here are some images of the base modified in New Rome addon (which uses more recent Mars HRSC high-res texture pack and places the base in Valles Marineris):

Family spacecraft approaching Martian spaceport by Clive Almeida

Inspiring scene from our bright future where humanity has colonized the Solar system - family spacecraft approaching Martian spaceport by Indian concept artist Clive Almeida; an image from his concept of a Mars theme park "Mars: a brave new world". More of his art here.

SpaceX spaceport on Mars by Mike Winkelmann (beeple)

Picture of the Day 20/1/2019 - vision of a futuristic SpaceX spaceport on Mars by digital fantasy artist Mike Winkelmann, better known as beeple. More of his art here.

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Spaceport in large Mars cave by Connor Sheehan

Picture of the Day 9/9/2018 - Spaceport in a large Mars cave by British concept artist Connor Sheehan. More of his art here.

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Mars colony with domed gardens and spaceport by Duncan Li

Picture of the Day 31/8/2018 - Human colony on Mars with domed gardens and a spaceport by Australian concept artist Duncan Li. More of his art here.

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Space station orbiting Mars by Brad Wright

Picture of the Day 20/2/2018 - Space station orbiting Mars by British concept artist Brad Wright. More of his art here.

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SpaceX ITS spaceships at Mars Base Alpha by Maciej Rebisz

Picture of the Day 12/7/2017 - SpaceX ITS spaceships at Mars Base Alpha or "Alpha Site" by Polish digital painter Maciej Rebisz. More of his art here.

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Some close-ups of the painting:

Space station orbiting Mars by Ville Ericsson

Picture of the Day 28/2/2017 - An international space station orbiting Mars by Swedish concept artist Ville Ericsson.
More of his fantasy art here.

Space station in Mars orbit by Glenn Clovis

Picture of the Day 22/12/2016 - "Phoenix" space station in Mars orbit by sci-fi artist Glenn Clovis. More of his art here.

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Mars colony by Pete Ashford

Picture of the Day 6/4/14 - A drawing "Welcome to Mars" (2010) by Pete Ashford from United Kingdom.