Maybe put a black wash on the highlights and do them again because they look a little thick to me.

You're uruk-hai are pretty good though the highlighting on the gloves of the warriors of minas tirith are a bit too bright. You could try adding a series of glazes, very very thing paint, to the gloves to help make them fit in more.

There is still quite a visible gap on the troll chieftain's arm. You might want to add a small amount of green stuff around both arms, similar to what you did with the other. I'm looking forwards to seeing your trolls all painted up.