To import graphics, open the main menu and select Import. Then choose the source. Photos lets you import from your photo collection. The Camera option lets you take a picture using your device camera. You can also import a graphic file using the File option. The app supports SVG, TIFF, PNG, JPEG and PDF formats.
If you want to fill a shape with an image, use the Color panel. Note that the Color panel does not support the SVG format.