Screenshot: Embedding an image link in a comment.

On the new photo page for a given image, there's a pulldown menu labeled "Share this".

 

Pull down this menu and click on "Grab the HTML".

 

A text window will open. Choose the image size that you want from the pulldown menu below the text window. Select the size that you want, e.g. "Medium 500".

 

Highlight the text in the text window by clicking once inside the window. If the text isn't highlighted at this point, hit Command-A to highlight it. (Ctrl-A on Windows).

 

On an Apple, hit Command-C to copy it to the clipboard. (Ctrl-C on Windows).

 

Now go back to the comment you're working on and place the cursor where you want the photograph to appear in the comment.

 

Hit Command-V (ctrl-V on Windows) to paste the HTML into your comment. When you're done commenting, submit it in the usual way and the picture (with a hotlink to it's corresponding Flickr page) will appear in the comment.

 

You can backdate the image that you're linking so that it doesn't show up at the head of your photostream.

 

For example, I backdated this image one year

Done