Paddy -
If the pictures are links to your local PC they will not work for OneDrive Sharing. They need to be links to the internet or to OneDrive shared files. I showed you how to make them work by embedding those pictures in Word, and how to test that it does indeed work by opening the link in another browser that isn't signed into OneDrive so you are seeing what your respondents see and not your OneDrive which will show more..
Here's the most complete guides for OneDrive Sharing I find:
https://cortavo.com/onedrive-file-sharing-begin...
https://blog.syscloud.com/onedrive-shared-folde...
I hope it helps. Keep asking back questions and I will answer with the best resources I have.