I'd suggest the following two point to improve the background image panel.

Fix focus loss

The focus is lost when the following actions occur, which can confuse users who rely on screen readers or the keyboard:

• Add new image
• Reset image

The add background image button should be focused after adding/resetting the image (Example of the color panel).

Add reset button

Update: There are already two reset options in the dropdown, so we don't need to add an additional reset button.

All the other similar panels (Color, Shadow. Duotone) have a reset button to the right of the button:

It would be good to add the button to the Background Image Panel as well.

Note that the following spec is required:

• The reset button should only be displayed when:
  • the image is set and the toggle button is hovered
  • the image is set and the reset button is focused
• When the image is reset, the toggle button should be focused