the question is, what did you do right.
apart from the obvious flaws in ship design, we have also the rule that double black pixel lines are forbidden in all but certain cases. right now you have made your entire ship of lines more then 8 pixels thick. that and other points is why I linked to the guidelines of shipbucket.
in ship design.... at this stage, we cannot really help how to improve, we can only tell you were to start:
- look at the archive on the main site
- look at real ships
- learn from them, and try your own following our standards
best advice I can give
not trying to be rude, just trying to help