@Political
You can also look for artwork licensed CC0 (public domain) or CC-BY (you can do anything with it so long as you give credit to the artist). CC-BY-NC (CC-BY with added stipulation that art not be used in commercial projects) would also be acceptable, since this isn't a commercial project.
This is a good site for concept art, 2-d game assets, etc. If you want to get creative, you can even download a 3-d model, pose it, render it, then use the rendering in your game.