Hi Andrew. In the code you posted here there is an extra space after the file extension, inside the quotes. That will look like a different url to the server when it tries to serve the image. Be sure there is no space before that closing quote in actual usage. The image loads when I grab just the url so this should work fine for you.
It appears the quotation marks " around the URL aren’t correct. It could be because you copied and pasted it. Can you delete the quotation mark and type it again and see if it works.