Being a carver myself I can't but admire your work. You asked for suggestions. Allright here you have one. On this front side you carved the buildings and whatever motive you want in the foreground. On the other side of the bowl you carve the background, trees with animals for instance, to bee seen from this same side. That will add a great depth to the scene. Moreover, once finished you will be able to look at it from the other side or in 3/4 view and see how the view changes. It would be as looking to a wooden hologram if you know what I mean.
Don't get me wrong, I don't mean to carve from inside the bowl to see the scene from only one view point but rather from any point around, so there must be some empty space in between the figures what ever they may be to allow to see part of what is carved on the other side.
That effect could be enhanced by putting a spot light on the mouth of the bowl on in the bottom to illuminate the interior, and if that light is of a different colour you can get great visual effects or so I think. Dunno...