I've now finished the Legion Extraterrestriale, at least for the time being.
Some new figures:

Automaton controller/mechanic, guidon bearer (a reworking of my flag bearer, using a Warflags FFL guidon with the legion name changed via Photoshop) and the first of my extraterrestrial legionaires - Legionaire Ssnark; a purple crestless skink (known as Futter's Skinks, after the anthropologist who discovered them on Cytherea)
When they landed on Cytherea, the Legion suffered from a lack of ground support steamtech suitable for operating in the Cytherean jungle. To solve this they converted commercial steam vehicles and automatons to meet their needs. The steam strider photographed previously is one example. This automaton is another:

This heavy automaton is armed with a heavy flame thrower and a large spar torpedo, allowing it to take on all sizes of Cytherean carnivorous flora and fauna. The skull is a souvenier of the Legion's service on Mars.
The Legion so far:

In the future intend to add another infantry unit (including more aliens) and some armoured steam vehicles, but this will do for now.
My ground forces so far:

Now to get on with my air support.