The airbrush allows you to create effects like snow, tree blossoms, or even braided or curly hair. It is surprisingly versatile.
The pencil and the brush allow you to paint and draw using your mouse.
The magnifying glass allows you to increase the size of an image, making it easier for you to work on.
The capital letter A icon lets you create a text box on the canvas.
Other icons allow you to make curves, lines, and other shapes.