Yes, if the screen shot is put into a file first. In the comments section below the bug, you can attach a file to the comment (using the Browse button), and it will appear below the bug when it is displayed.
It would be very, very, very good if Dragnet supported just pasting in a screen shot. (Removing the middle step of having to save the image somewhere, and then attach the image to Dragnet.) Just my two cents.