Creat a new document (Ctrl+N)
Size at 800x600px or 1024x768px that suitable for your monitor.
Pick Gradient Tool
Choose this gradient from the Gradient Editor
If you can't see this gradient, please go to "Load..." ~> Point to gradient preset folder
inside Photoshop folder ~> Load "Special effect"
Hold your left mouse and drag from A to B :
And you'll have this result :
Download and load this brush into your photoshop : Land_brush
Choose any "island" inside this brush set that you like :
I choose this one :
Creat a new layer on the top, brush in the middle :
Creat a new layer and put it under "island layer"
Pick Eliptical Marquee Tool
Make an eliptical selection :
Fill this selection with color #12a80d
Continue making creat new layer and fill selection like this :
Download and load this brush into your Photoshop : Tree_brush
Pick any brush inside this brush set that you like, creat new layer on the top and start
Download and load this brush into your Photoshop : AK_VectorPeople
Pick any people you like and put them on the grass :
Download and load this brush into your Photoshop : Cloud Brush
Creat a new layer under "island layer" and brush a little...
You've already finished this tut with sample details.
This is my final result with some other details :
(click on the picture below to see full size)