My impression is that your polygon count is too low: you're sacrificing so much detail that the model becomes "a generic bomber" instead of the B1.
Your silhouette should remain as intact as possible.
The point is not to make a low polygon model, but an as efficient as possible one.
It is very possible to make a judgment on a non textured model, on condition you turn on “edged faces” in combo with the shaded view (Right click on the viewport name)
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