Great point about the neck. I like a neckless head sculpt on characters who have exposed chests, and when they can hide the joint by cutting along the jaw, beneath the ear and then right into the hair ... but with the costumes on these guys, none of the figures in this line thus far need neckless sculpts. I think Ned, Jon and Jamie would all benefit from necked sculpts.
What also kind of surprises me about the neck pieces that ThreeZero included on those figures is that they're the standard size.
Most of the time that's a good idea, but when you have characters with this many layers of clothing, engineering a longer neck actually makes them look better. Look at Tyrion. When you strip that figure down, his neck is hilariously long. But it works beautifully when the figure is dressed. At this scale, with so many layers of costume, Ned, Jamie and especially Jon look a little short-necked. The difference is subtle but I think it would improve all three of them.