Ah...well why didn;t you say so

Cut off the nose and remodel it - possibly add long 'clips' for holding cargo pods (i.e. like they curl round a cargo pod attached to the underside).
Add 'surface detail' to the top and underside - stuff like blocky exterior cargo pods or generic tanks.
Add recessed areas for lighting, in particular to the 'bridge' area.
Add small platforms for any defensive turrets.
Take anywhere where you just have a trapezoid shape, and look at ways of breaking up the flat edge - stuff like outdented or indented areas.
Take that upper strut on the topside, and break it into 2 - possibly make a gap between it and the main 'hull' so it';s kind of like tubework.
Model detailed engine work. If possible, make sure it looks like the engine is not just bolted onto the end - ie. make it go further 'in' to the top / bottom parts than at the side.