I did a little composition exercise recently.  There is a legendary reference sheet for graphic novel and comic artists called "Wally Wood's 22 panels that always work".  Evidently it was developed to help artists new to the demands of sequential art cope with conversation-heavy scripts.  Another title for this might be, "how to keep things visually interesting when nothing's happening".  You can see a printout of the original sticking out on the right.
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