Terrain Change Options

[katasu]

Okay I was wondering what the best course of action would be. I'm trying to map a few maps going from being snowy to being free of snow and was wondering how to do it.

[katasu]

I think I got the terrain change looking okay and how I want it, but now I need help with mapping a Town Square in what is a medium sized town. In the square I want there to be street vendors and then they'll be three paths. One going to the castle area, one going to the residentual area and one going to the town's main income(an industrial building.)