Awesome highlighting. There is a lot to learn about color theory but a good rule of thumb is to look at other characters in media or games that you like the pallet of and copy that. Pay attention to the ratios the of colors and follow that. For example, pikachu is 90% yellow, and then a few percent black, red or brown. This color scheme could be adapted to this miniature with perhaps yellow cloth and armor, brown skin and red/black detailing.
Pikachu may not be the best example since it does have such a high amount of a single color but you probably get the jist.
Great points by other people here so I won't reiterate, but did want to throw in Mothership as a horror game. It's quick and easy to run and play. Would highly recommend.