1-#3-Everything looks great....one prob...the bg color...u should also blend the clouds more so they have a soft look^^
2-#6-highly detailed hair is a plus but everything else isn't and the hair that is above his head should be shaded towards where it was tied...
3-#2-I love the bg colors^^, but the coloring on diedara isn't as great...
4-#1-the hair doesn't look right, too strainy?O.o...everything else seems fine^^
5-#4-I like it but the shadings should be darker so there's more contrast...and completing the entire page would have been a plus^^
6-#5-colors are way too bright and the red bg hurts it dearly:/
OVERALL-they all have their plus and negatives, but the good things outweigh the bad on all of them so great job everyone!