Photoshop Drawing
Draw a full background scene using photoshop.
Start Off with a new document to the size you want, I chose 500×360 pixels.
Make A gradient shading from sky-blue to white
Draw a circle using the elliptical shape tool (
)
Make sure your settings are like this 
Click on Add Shape (
) and start drawing more circles to create a cloud-shape
Merge all (circle)layers together except the background
Go to the layers window and click on the little “F” for the layers style options (
)
Apply the following settings
Now repeat the process for more clouds placed randomly in the sky
Draw another circle with yellow, for the sun
Go to layer styles and apply the following settings
Now select the custom shape tool 
And choose the pinetree shape from the custom shapes menu
Draw in the tree shapes randomly using different sizes
Copy this pattern, paste into photoshop and define it as a pattern (edit>define pattern)
Now click on the layers style for the merged tree shapes and apply the following settings
Go back to Layer styles and do the following settings
and
This is your finished image, you can of course add more trees, clouds, and even add some birds or people
