[Kamog]

Well, I think the reason the yellow stripe might look fake is because the dividing line between the grey metal of the ship and glowing stripe is too abrupt. When we look at the white glowing rectangular section on the engine on the third ship, that glow doesn't look fake because the white part is inside an inset - the glow is coming from a recessed area. The glowing stripe isn't recessed, so the edges of the stripe look too simple and therefore "fake".