Importing photos to your canvas is a few clicks away.  
On Sketch, Doodle and Photo Desks, you can add an image to your canvas by tapping on the image icon on the top middle toolbar. Or you can also do this by creating a new Image layer through the Layers Panel of Sketch and Doodle Desk. Both these methods let you import an image to your canvas using 3 options; Gallery, Camera and Files.