A pixelation of this image: i160.photobucket.com/albums/t199/ooshmaster/twentyfirstcenturyfoss.jpg
"21st Century Foss" by master science fiction artist Chris Foss, painted as the cover of the book of the same name, published by Roger Dean's Dragon's Dream company.
Had a lot of fun with this one. This palette was very enjoyable to use and worked surprisingly well despite looking super hard at first, and I managed to put all 15 colors to good use.
last minute edit: took some advice and made the background a little less busy, taking out some stars and making the rest darker.