I've installed Magento 2 with Data and it all installed well and all data and images where there.
I then created a theme based on Luma and as soon as I activated the new theme all the images have disappeared.
How can I bring the images back?
Make sure you have created correct File & Folder Structure. Please follow
Please Inspect & Check for Image Path/URL & refer Magento 2 - Create New Theme based on the blank theme