Tree vs Factory

I upload the sketch with a camera from hand phone and it looks not clear enough, so i start with redrew the outlines.

Then, I create a new layer and brush brown color for the tree log.

After that, i create another 2 new layer for the smoke and factory. Grey color for the smoke and blue color for the factory.

I try to use a gradient map for my background but it seems doesn't good enough. I did try other background and draw something at the background but it is not working well.

Lastly, I search on the web for a background image, I choose an image of sunset sky as my background, this actually generate a gloomy mood which suit the message that this picture indicate. The tree log inside the smoke that coming out from the factory tells a message, which is trees are being cutting down in order to build more and more factory. This will then results in causing the global warming issue become more and more worse.