Just open any flikr image on your account. At the bottom right of photo are some option buttons, click on 'share photo' which opens up several codes - choose HMTL embed. A code highlighted in blue will appear, right click to save and paste in notepad or wordpad.
Now you have to isolate the direct link to your photo. Here is an example of what it looks like. In bold is the important info for direct link:
<a data-flickr-embed="true" href="https://www.flickr.com/photos/99754592@N04/22769899916/in/dateposted-public/" title="underwingDetails2A"><img src="https://farm6.staticflickr.com/5649/22769899916_36e4d84f2b_b.jpg" width="881" height="582" alt="underwingDetails2A"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Paste that in a new browser window and your photo will be isolated. Now you can look at the properties of the photo by right clicking the image. Another small window will open and that is where you can uncheckmark the box that is preventing direct links.