If I paste an image or drag-and-drop an image into a note, it’d nice to be asked if you want to name it.
Then if you choose not to give the image a custom name, you could allow users to specify a template to use to name the note, but that seems a bit much and more than needed.
If no custom name is given, you can default the name to something like:
{{currentNoteTitle}}-hh:mm:ss
That makes the image easier to find later. (And if it’s in the same folder, then it’s adjacent to the note in the finder.
The hh:mm:ss would help avoid the need to programmatically increment multiple pasted notes or to rely on the finder to differentiate duplicate file names (by appending (1), (2) to the file name).