When the words see and the pictures say

I am finding in writing and drawing there is a furious give and take between the two. As if they were two powerful nations declaring ownership over uncharted land between them. The country of Writing gives names, histories, and descriptions to every feature and plaques of local interest sprout from every hill, house, and pond. Then the country of Drawing comes along, caring nothing for all the site markers, brings plows, landscapers, and architects and reshapes the scene for dramatic vistas, urban oomph, and pleasing gardens.

"I don't need you to shift everything around, I already noted in plenty of prose what everything is, its history and meaning!" shouts the Writing explorers.
"Feh, words," sneer the Picture morphers, "Show, don't say."
Then the plot rises and illuminates likely paths and casts shadows on everything.

What can't be shown in words? What can't be said in pictures?

I know picture books and movies have to figure this out. In a more subtle way, poems do too. How much do you tell? Where can an image suggest all you need to say?

It's a land grab. I'll let you know which flags get planted.