This image already helps illustrate the claim "Recycling household waste benefits the environment" it only needs more information so the reader fully undestands it's purpose. The best way to do it is by putting a heading, that means a title, this will give the reader the topic, he will know wihtout any vagueness what the author is talking about. The image by itself without any explanation can confuse the reader, it can be about making some art or just throwing the garbage for example.
Now that the topic is stablished, some facts are needed to deepen the information. Supporting evidence makes the claim stronger, it helps the reader being convinced of the argument used. In this case it also helps relate the image with the benefits to nature as they can't be seen in it. This is called a caption, it is a small text giving information about an image relating it to the text.
