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.