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I can tell your new at this, so I'll go easy on you. The overall design looks to be some sort of sci-fi, but the model looks too soft and squishy. As a rule of thumb, I say never use sub-surfacing unless your doing organic modeling. Remove that modifier and it would look 100% better. It's a decent design, but it lacks details. Try adding some panels or something to the walls to break up that smooth surface. Last but not least, you need to give this a good texture. If you don't already know how to UV map, I suggest you look into it; Then look for a good texture resource website, there are quite a few out there.