Ah, as the organisation of this project is still forming and there isn't much more graphics needed for 0.1, you have to take initiative
Take a look on requests or other topics. I know it's frustrating as there isnt anyone to give clear tasks or specs what is required, but these usually get sorted. Anyway, there's wide range of work to choose from:
Few suggestions for what we'll need sooner than later:
-More stars. With or without animation. Those that we have are good, but they get repeatitive.
-More planets. Once again, we have good ones, but few more wouldnt hurt, specially if you can make them spin and have nice cloud layer.
-Comet would be nice as well.
Shipdesign: make your own complete serie finished, with cutter- frigatte - cruiser - battleship - dreadnought - leviathan sized ships.
Race: take a look on races suggested, pick one that you like and think it's probaply going to be ingame and do graphs for it. Even if the race as it is wouldnt be ingame, your graphs would get used anyway. And background pictures/settings for those races, probaply insectoids diplomatic room will have hive-like background, and humanois have bit startrekish one, use your imagination. What is needed: basic diplomacy windown picture of member of this race with good backround, something like 1280*1024 would be good resolution as it can be then scaled down easily if needed. Then graphs of scientist, member of military and a spy. And small icons of farmer - worker - scientsist - military, size 64x64.
Technology: for example, do rotating 3dmodel/animation of laser cannon/advanced laser cannon/research center/advanced mine/whatever, even though those arent decided yet, graphs can be used anyway.
Planetary background images: no idea if these will be in or not (I really want them to be), so do a picture from surface of radiated/barren/ocean/terran planet. These are fun to do.
Animations and cutscenes will be decided once we know more about backgroundstory. Anyway these are all graphs that will be needed later on. Once se start working on 0.2, there will be more urgent requests that so that you can see fruit of your efforts in-game with quite short waiting. My recommendation would be that you finish your shipline as you have skills with them and you're doing well so far
and those technology graphs will be fun to do. Race pictures I would leave till later as they can be very timetaking to do, but if you like challenge, go ahead. Anyway, it's better that we have graphics ready before the programming team needs them.
There's so much to choose from, I cant myself really decide what to start working on once those requests get sorted, probaply some planetary background pictures or I'll get that shipline of mine started