Place a unique ID in the doc text where you want the image. Surround the uid with double straight brackets so: [[UID001]] Make a note in the same document and place another set of double straight brackets so: [[]]
Inside the brackets enter your uid, then 2 dashes and enter the text that you want for the caption. So: [[uid001--caption]] Now, copy your image, place the cursor between the two dashes and paste. So:
Open the image in an image processor like photoshop or preview Choose Edit->Select all Choose Edit->Copy Paste the clipboard with the image bitmap to the note item.
btw, you can also drag the image from the desktop to the note. Happy imaging!