I just picked up the 1/48th scale P-38 sitting on my desk, rotating it to the same bank angle. Looks just like the photo. Superfly said it best, "it's called perspective". If the wings have 10 degrees of dihedral,and the plane is banked 35 degrees, one wing will be 45 degrees to your view, the other 25 degrees. One will appear shorter than the other.
My regards,
Widewing