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Some interesting ideas design-wise, but the geometry and textures needs a lot of work. For geometry, you could start by beveling your edges, adding some greebles and nurnies and getting a proper UV unwrapping for better textures. For texturing, you could vary the materials between the barrels and other parts, add some lights, some rust, maybe some more details with a simple normal maps such as rivets or panels...
Just my 2 cents, of course.
Thank you for your feedback.
Much appreciated. :)
