Nords
Ancient = ancient mythological Norse / Scandinavian
http://t0.gstatic.com/images?q=tbn:ANd9GcSw0vWTXQP3BHPlU5pDHqkOLbbyFH6ioRPR-j_CKGjC9NRV0RwUPVgiBTdp
http://i3.squidoocdn.com/resize/squidoo_images/-1/lens1869593_1329747496a-aa_.jpg
As I've assumed you have vikings in mind (like everyone else when we are talking Nords) I have to say that these pictures doesn't represent them properly. The first one isn't all that bad to be fair, but not perfect either, while the Amon Arath cover shows something akin to a Warhammer Chaos warrior rather than a Norseman. Since I'm in the mood I'm going to link some illustrations depicting viking-age Scandinavians.
http://www.doyle.com.au/images/gathering.jpg
http://farm4.static.flickr.com/3285/4560753932_0b17da9012.jpg
http://www.doyle.com.au/images/sanhogg.jpg
http://www.theartoftimide.com/pics/Vikingbattle.jpg
Modern = Norse / Scandinavian into Teuton (Teutonic Knights) Northern Europe
http://www.dontiffney.com/images/Viking%20WarriorDTP123.jpg
http://www.wulflund.com/images_items/norman-warrior-figure_2.jpg
http://www.michtoy.com/michtoy/PEG-90046.jpg
http://britishbattles.homestead.com/files/europe/centraleurope/teutonic_knights_await_battle.jpg
On the first picture: While it's likely that you'd have more than a few Norseman wearing such a helmet I have to point out it's not Norse in design, but Slavic. Many vikings did go east (mainly Swedes) so as said it's both plausible and probable that a viking would wear it, but I'd like to avoid any misunderstandings if possible.
Second picture: As it's name suggests it's a Norman warrior, but that doesn't necessarily mean he's from Scandinavia. There were Normans in Normandy, France (hence the name) for instance, so he might be French in most ways. His gear isn't all that unique either since you'd see similarly geared knights or warriors all around Europe, depending on the time period.
Concerning the third and fourth pictures: Both might also fit the Bretons, to be honest. Aside from them being Knights of religious orders, they fit the western European feudal picture pretty well. To be fair, medieval Scandinavia would be similar, with nobles and knights and peasant levies, just less developed. But it feels more like Nords are a mix of stereotypical vikings and barbarians rather than proper medieval Scandinavians, like the ones seen here. http://desmond.imageshack.us/Himg59/scaled.php?server=59&filename=53473942.jpg&res=medium