I know you intended for it to be quite plain but I honestly think you should add some detail.There are two main parts of the ship: interior and exterior.
You can always search for Gaeel's topic that has the link to his long (and reliable) list of tilesets and gradients for any tilesets you may desire to do so.
EDIT: Juni asked me on IRC, so beta slot two goes to her.Something I'm missing here? O_o