I will try to give some advice: (IMG:style_emoticons/default/winking.gif
Maybe you can lose the picture behind the city.
I would not blend the Stargate ring.
And about the people, maybe you can do them black and white or one color if you can't find enough highress sources.
I would lose the green block, maybe you can use an other template or do it custom yourself.
If you want to keep it then make it a different color than green. Use the light blue or the dark blue from the front.
The credits are way to small.
I think the spine is to busy with all the logo's
Hope this helps you and maybe you can use some ideas.
Maybe some other members can give their ideas also.
cheers nonini. (IMG:style_emoticons/default/8834.gif
ps: try to link the cover correct so they can see it in the forum right away. (IMG:style_emoticons/default/winking.gif