Dave - It looks like you have got the end of the photo address showing, the ".jpg" bit.
But you are still missing the "https://" bit from the beginning of the photo address.
It might be that you are not highlighting the whole code before you try to copy and paste it.
If you start at the .jpg bit, then keep going to the left until you highlight the http bit as well.
Unfortunately, this is a lot easier to explain visually, rather than using words.
So I hope the following makes more sense...
I have added some spaces to the "I M G" code so that you can see the full address of one of your previous photos.
[ i m g ]https://lh5.googleusercontent.com/-AAtF0qZ349I/U65j9ptlXRI/AAAAAAAAG84/K13woQBDrbU/w934-h622-no/Migla+racing+-+race+ready%2521.jpg[ / i m g ]
I have to add the spaces, or that code would appear on the screen like this.
Good luck, Paul.