On the initial and final images, you may want to consider removing a few of the lines, some of them seem out of place. The overall result looks a bit cluttered. I'm reverencing some of the lines in the Ogre's neck, and the wizard's cape.
I'd also suggest a litle more time/attention on defining some of the underlying shapes, ie: the shape of the face, shoulder and bicep.
And really, they would look better if you cleaned them up a little.