Red Mars, Green Mars and Blue Mars by CarlosNCT

A set of artwork by Spanish digital artist CarlosNCT inspired from three phases of terraformation of Mars in Kim Stanley Robinson's Mars trilogy. Click to view in full resolution:

Phase 1. - Red Mars:

Mars colony by Don Dixon

Picture of the Day 31/1/15 - Astronauts set up a relay antenna near a Mars colony by Don Dixon, 2005. More of his space art here.

Mars colonies in Babylon 5

Babylon 5 (1994-1998) is far from being my favorite sci-fi TV series (to be exact - I have watched only one episode: s04e10 "Racing Mars"), but it is one of very few TV series / movies depicting human colonies on Mars in some of its episodes (Mars is only a minor stage for story of the series). In Babylon 5 universe the rapid colonization and terraforming 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 control with an aim for Mars independence. You can read about Mars in Babylon 5 universe here. Click to view in full resolution:

Martian base concept by Janek Kozicki & Joanna Kozicka

Polish engineers/architects Janek Kozicki & Joanna Kozicka has long been working for an architectural design proposal for a Martian base after NASA (or SpaceX) will land humans on Mars for the 1st time. They call it a stage 2 and stage 3 Martian bases (stage 1 - 1st landing base; stage 2 - a small permanent Martian base; stage 3 - small Martian settlement; stage 4 - Martian cities).

Stage 2 Martian base by Janek Kozicki [PDF of the concept here]

Mars base by Bryan Versteeg

Bryan Versteeg is one of the best conceptual design artists for space exploration nowadays. Today I have picked one of his concept art pictures for Mars habitat as my "Picture of the Day" for Mars colonization.