They look good so far, what sort of critique were you looking to get? What sort of aesthetic are you aiming for (ie realistic, high fantasy, etc.)? Also, are these going to be textured and coloured or left as plain models? I'm assuming poly count doesn't matter since they are to be rendered and then used.

A note about top down things don't read very well as what they are, so you might consider scaling in the tops of objects, like they did in the old Zelda games, so you can see the sides of things even in top down mode, just a thought, I don't know how well that might work in actual practice.