exclude an element inside a class

Hi,

For a wordpress page I put the css class .tenten p {width: 80%; margin:0 auto} to shrink the width of any paragraph. Now wordpress puts automatically

paragraphs when its encounter an element.

I try to exclude by adding this rule .tenten p a img:not(.tenten) {width:100%;} but does not have an effect and I understand why.
I do not want to put the images in different sections, in separate divs.

Is there a way to exclude the images that are inside this class?

This is the page http://baliweddingblog.com/weddings-by-natalie/

Thank you for your time.

Regards.