Hey Panos,
I love those knights. The viking shield isn't a problem, exept for the leader: this round shield is awful. You could try to remove a sticker from a silver shield and put it on a golden one. The Normands used larger/taller shields, the closer you can get is by turning an aegyptian shield upside down though the square edges at the top don't fit with Normands shield. The Normand shield was also curved like the large Roman's.