Finally, put my symbol into it.
Done!!!
then color the grass.
Then i put background color into it.
After that is the leaves, i put some yellow color into it to prove that some part of the leaves was pollute by the factory's smoke.
Then, the stem.
After that, i colored the smoke by also using gradient.

The chimmy i also color it using gradient to make it more reality.

After that, i color it. The window and the door i color it using gradient.
Then, i create 2 new layer sommore and draw the leaves and stem of the tree using pen tool.

Firstly, i sketch the factory using pen tool and seperate them into 3 layer that is factory, chimmy and smoke.