As for the model, which program are you using? Because the ship looks horrible in those view ports. It's not the quality of the model, it's the quality of the lines that makes it look bad.
My first impression is that it doesn't look Libertonian at all. The bridge shares no resemblance to other Liberty ships and it appears to be far too short, like it's had the engine cut off it's rear.
My recommendation would be to have the Liberty Dreadnought open in milkshape while you build, and look at the style. The Liberty capital ships are very detailed ships, something that you can't really comprehend until you observe it closely.