I don't have any other metroid prime concept art. It can be difficult to find online, but I do have plenty of andrew jones' work, which is usually just as high in quality, but a little different in style..
I've uploaded a few more pictures under the artist andrew jones. I hope that these types of images will be allowed here on the board as they are not directly influenced under an anime style of artwork, even if I believe them to be of very high quality, in both artist choice and presentation.
I cannot source these pictures directly because they all presented in flash on his main site - which you can find under the artist name :) I also have plenty of pictures that do not appear on his main site. I would upload more, but since I am not a privileged member I can only upload so many pics per day ;) stay on hold for more.