Mars Base Alpha in a crater by Anastasia Volyk & Vladyslav Lysenko

Ukrainian 3D artists Anastasia Volyk and Vladyslav Lysenko have created a concept for SpaceX's Mars Base Alpha in a small Martian crater. The individual habitats scattered on the inner slope of the crater wall are connected with the center of the colony via partially underground hyperloop lines. In the further future hyperloop lines could connect Mars Base Alpha with other human colonies on Mars. I would place Starship launch pads outside the crater.

Martian colonies in Babylon 5 TV series

Babylon 5 (1994-1998) was a popular sci-fi TV show in mid-1990s. Mars is one of the secondary locations in the show coming into spotlight in the second half of season 4. In the universe of Babylon 5 the rapid colonization and terraformation of Mars starts in mid-22nd century with only limited scientific missions before that. As in almost all fiction about colonization of Mars, eventually there rises a rebellion against Earth's control with an aim for Martian independence. There are around 2 million inhabitants on Mars at the time of events depicted in the show. You can read about Mars in the universe of Babylon 5 here.

Babylon 5 was one of the first TV shows / movies heavily utilizing CGI to depict the exteriors of a human colony on Mars. At the time most filmmakers used miniature sets for that purpose, as in the famous Total Recall (1990). Here is an ultimate collection of CGI scenes set on Mars in Babylon 5; you won't find more comprehensive such collection anywhere in the internet. Take into account the CGI scenes were done in mid-1990s with very limited graphics processing power so the resolution is low.

1 million human colony city on Mars by Max Rymsha

On 2017 HP announced the "Mars Home Planet" rendering challenge inviting participants "to imagine, create and virtually experience a sophisticated civilization on Mars. A new home for one million humans." Swedish architect and CG artist Max Rymsha was one of the winners of the challenge creating his concept "Between The Red Mountains" for a sustainable city on Mars for 1 million humans. His inspiring vision includes several large-scale biodomes, SpaceX's Starships (in their 2016 design) for Earth-Mars transportation, hyperloop lines for intercity transportation, electric rovers and quadcopters for local transportation, laboratories of NASA, etc.; most of the city (not shown in the illustration) is underground for better radiation and asteroid protection.

Infographic version with annotations: