Images in parent theme not loading in child

I am new to WordPress and started off using the twentyeleven theme. Currently I am experimenting and trying to get my head around the way wordpress functions.

I did not initially create a child theme.
The site is https://www.seniorearners.org
I loaded a number of plugins I plan to use and put in some blog entries. I also imported images before realising it would be sensible to create a child theme.

When the site is visited with the parent theme activated images are shown but when loaded with the child theme they no longer load.
The site is currently up with the parent theme activated if anyone wants to take a look! I can switch it to the child theme at any time. When I do it only shows the original theme images.

Should I be copying files/directories from the parent theme to the child? If so which ones?

Thanks in advance
David
PS

The child theme directory currently has a single file style.css

File contents:

/*
Theme Name: Twenty Eleven Child
Author: David Southwell ARPS AFIAP
Author URI: https://www.seniorearners.org/
Description: Child theme for Twenty Eleven for https://www.seniorearners.org
Template: twentyeleven
Version: 0.1.0
*/

@import url("../twentyeleven/style.css");

#site-title a {
color: #009900 !important;
}