I like your new wing placement and the greebling on the engine segment is well done. Just as a suggestion, even if you don't have the minifig you need, you might want to include your own sigfig in a shot to help judges better appreciate the scale of the ship and how it relates to your character.
As for the wing arrangement, in real aircraft, the center of gravity, or point at which the craft will balance on its nose-to-tail axis, is often situated as close as possible to the wing, where lift is generated. In practice, this helps make the aircraft more stable and controllable in flight. While sci-fi ships don't necessarily have to follow this rule, a fair number do (A-wing, X-wing, Y-Wing, etc.) since it generally looks more visually balanced to the eye. I like this one wing theme you have going, keep up the good work!