You can make artworks and concept art for all various things such as space stations, ships (ranging from small fighters and mining machines up to large cruisers and motherships), asteroid bases, portraits of people and faction-related stuff (logos, symbols, flags).
Check our forums or ask the community for suggestions!
Make sure to check Pictures section on our website as well as Miner Wars Encyclopedia for some ideas:
You can also get an inspiration from our already existing artworks by our artists and community contributors at http://www.minerwars.com/ForumTopic.aspx?id=2200
Deadline for the competition submissions is the 1st of April. Send us your artworks and win cool prizes!
The best artworks will also be considered for print, distributed in the box retail version together with Miner Wars 2081 (as an addition to game manual, etc.).
You can submit your artworks to our forum Contributing - Art (http://www.minerwars.com/ForumCategory.aspx?id=15)