looking good - love battlemaps myself, working on a big one at the moment.. .ok 2 big ones... ok.. perhaps 3 *lol* ... and a tutorial
as mearrin said, its the shading and especially the shadows that need the work the most. You need to ground your elements, and I'm sorry to tell you - but a drop shadow won't do it ... hand painted shadows, then you'll get the look you need, or sometimes I use 5 shadow layers copied from the original object