The main issue is the lack of contrast. A white background with a white ship is making not helping either. As a result, it’s hard to see the shape and distinguish the elements. The whole ship is very similar in colour with just a little bit of shading on the very edge. White is only ever really white when there is a bright light on it (or it is the light source itself). As soon as there is less light it will appear as various shades of grey.
Rather than go for a base colour that is pure white I decided to go with a 10% black (a very light grey) and shade it 50% towards the edges of the ship. The wings got a linear gradient towards the outside.
I also tried to avoid too many straight vertical lines. It makes the design look less dynamic. I rather tried to set up an angle for the wings. This would repeat in the patterns (the red markings as well as the flaps).
Moving the rockets from the front towards the wing balances the design out better. Thus making neither the front nor the back too heavy.