The approaching storm

UPDATE! The first shadows are on the canvas!

I just uploaded the image with the local color on:

I am looking for the composition with the first layer of my new painting. I plan to balance the picture with the zebra on bottom left, and the storm cloud on top right. The storm will be cool, dark, and the zebra will be warm, light with nice sun rays. The grass is going to show the movement of the wind, and I plan some flying particles (dust, etc.) in the atmosphere.