Suggest use of Template:Clear
I've been using the suggested code from this page for forcing text to start after an image: <br style="clear:both;" />. (See the tip following "Changing the size of the image".)
I just discovered that there's a template that can be used to do this: Template:Clear.
The template makes adding the code, SO MUCH EASIER. I don't know if templates are introduced before this tutorial on images, but it seems to me that revising the suggested code to use of the template would be very helpful for new members. I'd also suggest integrating the change into the instruction on templates (i.e., if this is the first use, keep it simple and come back to this example when templates are introduced; if templates are introduced before this point, provide the tip as an example of a very useful template.
Just a suggestion. Also, I'm happy to help integrate the change.