The following images from the The Millennial Project offer a view of some of the original TMP settlement concepts. They also offer a good example of the kind of artwork needed for the TMP 2.0 project.
Aquarius - interior concept sketch
Aquarius - submarine habitats
Asgard - Asgard/Solaria habitat interior
Elysium - view of terraformed Mars from lunar habitat
Solaria - ice mining on Jupiter's moons
Solaria - asteroid habitats