I don't think that I've commended your painting yet have I? So, bloody nice paint jobs, especially the hereldry on your Brets, very tasty... I would however say that the Grail Knights are nice all being the same, but each would have their own individual heraldry IIRC (might have changed in more recent background I guess). So, whilst keeping the unified colour scheme, I woulf have suggested using the same red and white colour pallete, but vary the actual design between each knight. Say have one quartered, one with stripes, one with checks, one with diamonds, one half red, half white, and a combination of all of those.
Needless to say as and when I ever get around to doing a Bret army, or for that matter a 100yrs war or WotR WMA army, I'm going to have lots of fun with the knights...
As to the dark green High Elves? Very well executed, but I'm not completely sold on the scheme. Have you tried using Gold instead of silver for the scale-mail? Or perhaps lightening the green a little bit...