This quick and super-helpful video from the geniuses over at the BetterCloud G-Suite Academy is a great start to using Slides as a means for students to publish their own work by creating an online eBook. Compared to apps like Docs or even Drawings, Slides is a much more manageable, editable, and beautify-able publishing app. You can also download the finished product as a PDF, a PowerPoint presentation, or as individual jpg or png images.
Remember, this does not mean that you have to use digital images as illustrations. Students (or teachers) can take pictures of their own drawings and add them to the slides. (My suggestion is to tape the picture to a wall or board and take the picture that way to avoid shadows.)