Great. ok first thought that comes to mind when i see the paper texture you used is that you are trying to also add some vintage feel to the design. The darker color and heavy fold in it is conflicting because the paper looks weathered and old but it is obvious it isnt by looking at the light folding. To fix that i would use a lighter paper texture with more subtle folds (go for maybe two or three horizontal folds and one vertical). its easy to make the texture yourself by doing your own folds, sticking the paper in your pocket for day along with random stuff to give it some authentic wear and tear then scan it (be sure to use white paper though and dont go too heavy on it). next i would make the gun a silhouette but include the lights with some soft glow then add a rough texture to the silhouette and background red (i've already written so much so im taking the lazy way out and giving you a link to a tutorial on how to do this eventhough its meant for photoshop its not too hard to figure out how to do it on gimp, had to use it for too long before i got photoshop: [link] steps 5 through 7). next i would simply move the red background to fit in the paper with a small margin all around, take out the lucasarts logo, and work out the fuzziness of the star wars 1313. Hope this wasnt as all over the place as it felt in my head. These are just some suggestions i thought could make this poster have more minimalism and authenticity. Sorry it was so long