City Layer 2635

This is an isometric view over the city layer in an RPG me and a friend is working for. Its not a computer based RPG that image is just created to see how it will look. And it looks ok.
Ammong other layers I am going to make... possibe... are Jungle layer, subcity layer and space layer. Jungle layer are underneath the city layer, and subcity under jungle layer. Space layer says itself...

Any tips hints on this I will enjoy. Annyway, Made on MSPaint and another anyway, this is my first isometric view EVER! and yet another anyway: Click on the image to make it bigger...