To my untrained eye it looks like the bottom edge of the Oval windows is missing, like it's 2 round ones with the hull cut out and the "outer rim" of the window wasn't reconstructed? Kind of like marking 2 circles and drilling 2 holes in the center of each circle(leaving a ring around the hole) and using something to chop out the center part, but not putting the same outline on the new edges? Possibly a strange glare effect of the shot and it's really there?
Anyways its looking great. I like the NX bussards on it. It would have been cool to see the season 5 configuration in production.