Blender game modelling level 1

This is my blender render:

Here is my blender link:

https://drive.google.com/open?id=1gK0ObEzAr0HC3_6y0gBmRh0nQu-y70rh

These are the images I used for textures:

For rock

For ground

For skies

For tree bark

For tree leaves

For walls