Often in ebooks there are links embedded in paragraphs that reference some image or figure in the previous chapters or sections. Once I've clicked on it (and viewed that image), how do I get back to the paragraph I was reading?
Hitting android's back button always exits the app.
To return to the last page you visited, you can just tap on the screen to notice a bar in the bottom. If you look closer you can see a blue triangle that marks the last visited page. Click on it and you'll return to that page!