Answer:
What I see in the picture.
Laborers in an African setting (based on color of skin and climate) sorting what is most probably agricultural produce into some sort of a pyramid arrangement. These goods will most likely be shipped to Europe.
Cause ⇒ Need for Raw materials
With the Industrial Revolution having taken full force in Europe, countries needed more raw materials in order to keep producing both new and old goods in order to make lives better for their people and gain an economic edge over their rivals.
They therefore colonized Africa to get to these raw materials when they realized that there was an abundance on the continent. The picture above shows some of the raw materials that is to be shipped to Europe.