I think the hills look OK, you definitely appear to be getting the hang of doing them.
Maybe its just me, but I still think what these maps need is some kind of texture for the grass, etc. it just appears "flat" (for lack of a better word). Not sure what you can do in CC3 as far as that goes. Or hell, just ignore my ramblings and leave it the way it is.
It all depends on the look you're trying for.
With or without the texturing these are still nicely done.