For a first map, great job.You've played with models, textures, global height edit, raising GATS, wall edit. and some shadow based lights. So its great you messed with most of the functions
For improvements of your town:
- Use sidewalk borders to blend in the stone walkways with the grass (Prontera has this)
- Experiment with Interior color lights
- Apply more details such as flowers and grass to the outside ground
- Look into Water Levels and Detailed Height Edit (Sloping)
I'm not sure if you used this (it looks like you did) but when you hold SHIFT while dragging a model, it snaps it to grid making it VERY easy to line up models perfectly towards GAT placements or just to build a wall / connect models without holes.