For a first attempt that's pretty damn good!
The way I layer is to get as smooth as I can first time round. It's never 100% but should be pretty good. There will be a few areas that are a bit rough but overall it should be pretty smooth. I then glaze the whole area with a very thin glaze of the original color. The glaze should be a lot thinner than the paint you used when layering. It will be almost transparent but will help smooth the transitions between layers.
Then I have another look. There will still be a couple of rough patches. This time instead of glazing the whole area I just concentrate on one roughish area at a time and just glaze that small section. There should be very little paint on your brush and it should be very thin. You will see it dry almost immediately and should see very little difference. Keep doing this until the change between layers has smoothed out. It does take time and practice to get really, really smooth layering but you first attempt is a good way along the road to that.
So, Layer --> Glaze whole area --> Check --> Glaze small area
Don't obsess either. When I started I would try and get everything perfect. It would take for ever and I never got anything finished, I just got sick of the sight of the mini and went to something else. It's much better to get a mini finished looking pretty good then having it sit on a shelf unfinished but with one very smoothly painted right shoulder. Move on to the next one, you'll have learnt some more and the next one will be better.
It does take practice but you’ve made a really good start! You find that a lot depends on the brand of paint you use, some need more thinning than others. Even the different colors in the same brand of paint will be different (Some colors can be more translucent then others, like reds or yellows, some blues I find I have to thin more)
Don't worry about the ice palatte bit. The video showing how to mix up your colours to get smooth tranisitions is brilliant, helped me no end.
http://massivevoodoo.blogspot.com/2010/03/tutorial-ice-palette-blending-tutorial.html
http://massivevoodoo.blogspot.com/2010/11/blending-tutorial-part-2a.html