If you're using forms protection, you can insert Section breaks either side of the area you want to leave unprotected, then exclude that Section from the forms protection - the option to do so becomes available when protecting a multi-Section document. For an example of this, see:
https://www.msofficeforums.com/word/...html#post28556
That said, it's also not possible to edit images in a document using forms protection. What you can do, however, insert the image into a separate (
unprotected) document, do your editing there, then cut & paste the image into your 'form' document. Alternatively, you can use a separate (
unprotected) document that's linked to your form via an INCLUDETEXT field as a holder for the drawing object and picture. Your users will be able to freely edit that document and, if you check the 'update automatic links at open' option under Word Options|Advanced > General, any changes to the 'picture' document should automatically be reflected in the form document.