vindicare
problem with this guy is he has so much glare somewhat that i really cant see enough details although i think you shaded and highlighted him i cant tell to what extent, looks fairly decent, i like the brownish color in conjunction with the weapons, maybe his eyes could use a darker base 1st then highlighted in the middle, give em depth and spookiness, he looks prett darn god really, i think the next step which would be into smooth layering and finer detailing would help him along. also theres not alot to him as hes kinda small and his guns are overpoweringly huge, id maybe make the brown on his guns a cracked marbleish color or something fancy. alot of his mini is weapons etc with basically a bare figure so id emphasize more detail in that area. some really nice stand out highlights on the guns edges and stuff. really bring them out. his guns are like a womans \"guns\" they really stand out on him. whereas it were the eversor it would be his skull and his claw hand maybe.
emperors champion
i see where you did a little lighter greenish highlight on his chest armor, if you could blend that up into the darker green that would be cool. also the sword, im not sure what effect you were going for, im thinkin fire, but to me its looks a bit more rusty than fire\'ish. i think some stronger yellow working its way along the tip running the edges and maybe blended into a white hot pic on the tip of the sword would be a great fire look. also his red cloak parts, i can understand the deep red deal, though it looks a bit christmas\'ish, i think it would be kinda cool to do the reds somewhat like you did the sword. like a deep red for shading, normal red for mid color and maybe someoranges and yellows for uber highlights. nothing strong but maybe slight hints with thinned out or watered down paint.
chaos champion
the horns look great, it would be nice to see that kind of shading on the front of his skull inbetween the horns (either that or the camera is screwey etc) also the back of his cape is sculpted torn up and rotted or something but it looks snuggly clean, id try adding some more depth into it and possibly playing with purples or even some green tints to it. nothing nurgle\'ee, but something to break up his total body blue. maybe some harder shadows going around the capes ripped holes with some highlights above the major tears, bring them out a little like those zits you see on giants and trolls, give them a little depth, though nothing that wild.
hope some of this made sense as ive not a clue!