I really like it. I think you should work on your light source though in the pictures. It looks like your light source is behind your models, which makes it hard to see highlights and detail on the models. Try to use at least two if you can (three is best!), one directly above the models and one or two from an angle on the sides or front. From experience I can tell you it makes it much easier to give feedback on painted minis when we can see it as well as you can.
Highlighting. Two things really come to mind thinking about my first steps into layering. The first is that you need to water down the paint. It's a tricky balance, since if you water it down too much the paint will just spill over the model(like a wash), but it helps tremendously. The goal here is that you have the paint flowing off the brush easily and in smooth lines, but not spilling over or into detail.
A decision you probably have to make is also where to highlight. Many people highlight as if there were a light source hitting the model from somewhere, usually directly above the model. It tends to look a little dark, but realistic. The other option (and one I find myself leaning towards these days) is to highlight the model to bring out the detail often irrespective of a light source direction. If you look at examples from GWs Eavy Metal team you will see the latter more often than not, since they are trying to show off the models rather than trying to make them look realistically highlighted.
Washes. I have never tried to paint much cream or white, but you may be able to make a wash from bleached bone or something similar by adding enough water. Even if you use an actual wash, I would still water it down. I find that most washes are too strong on their own, and if the goal is to just shade the recesses of the area adding a little water helps. One thing also about washes is that you have to be deliberate about applying it. Don't just throw a bunch onto a model and expect it to get everywhere you want it to and nowhere you don't. Apply it directly where you want it and check after it's run over the model a bit to make sure it didn't go somewhere you didn't want.
Great looking army though, it is a very brave thing you did to paint that much white!
