Well I don't know how to fix the boxyness unless somebody goes into full detail
At least it's better than before
Look at it from the front. Pretend the entire ship is black. Do you see a black box?
Look at it from the side. Same thing. Do you see a black box with maybe a few bevels and a ramp?
That's really boxy. Try adding extensions to the sides of the ship. Not little sticky out things, actually nice smooth, nice looking parts that blend into the sides of the ship.