Fury of the Wastewalker

[Avengeil]

For this summer my mini dming project is doing the Fury of the Wastewalker (with quite a few alterations to make it suit my taste). For those of you who don't know it FotW was the adventure for the second season of d&d encounters set in the world of dark sun.
Hopefully I will complete all of the maps.

Here is the first encounter of the series.
some stuff I want to fix is make the silt (sand and mud to the right) more realistic and trying to cover some more stuff in sand.




Comments and criticism is greatly appreciated.
Oh and do you have any ideas on how I can control the image from getting bigger and those edges coming outside the grid. I don't thinks it's a matter of grid placement because at the beginning it was fine.