When that happens to me, I check if the picture is jpeg or something similar. If not, I paste it in paint and save it in that format. Some of the other options that you have when saving are really very heavy. Then, when they are ready on the word document, I click on it, choose compress the picture (or something like that) and select the option for the web or e-mail. then save the document with a different name and get the information about its size.