How to add an image to a character sheet (NOT the character art)?

I've been sorting out a Lost Mines campaign and found that the Ash Zombie has an image of a zombie  in the text field . I would like to do this for all of of the character sheets, but I cannot find out how. There is no insert image button like there is for this forum and trying to edit the image itself just pops up with  this window , which doesn't tell me how to copy the style.

I know you can do it with the API.  I think you can copy/paste an image from another page while in Chrome, but it might be Firefox.

Aha, thank you very much. Copying the image itself was the answer. Thank you very much for the quick response!