I Most of the terrain in Kamah is small, steeped sided ravines or gullies so that views along them, and upwards and outwards, are very limited. Larger clearing-type areas are used sparingly. The overall ambiance of Kamah is, of course, tropical but the general approach to the design and layout of t...
Don't forget z axis, maybe add cliffs/mountains? Have your paths cross, maybe using a bridge, tunnel, waterfall, rivers etc. Try and build your areas at different levels so the map doesn't feel flat. I always try and have 3-4 exits from each room/area in a DM map at least one should be z axis (drop/...
For the hole just make a jagged hole shape with the 2d shape editor and subtract it from the ceiling, subtract a cube above it (with all faces set as backdrop, so it looks like sky above) For Snow? The simplest way would be a few vertical sheets with a panning masked falling snow texture. But that w...