Greetings and Welcome to Google Docs Help Community 😀
If the image is copied from an off-line program it will display as thought the image is missing. This happens because the imagine needs to be stored on-line for a doc's editor to access the image. If you can insert the image by uploading it to Google Docs from the local drive it should display properly.
Best,
Ms. Drasby
Google Product Expert
Google for Education Certified Trainer