The acf image field could be drastically improved by adding an action button that let a user to change image in only one click.
Actually you have to do two steps to change an image. You have to remove the current image (first click) and then choose another image (second click) from media library popup.
You can merge this two steps in one by adding a new easy action button as shown in the screenshot below.
clicking the new swap button a user can change image fast and in only one action.
Please take in strong consideration this improvement.
It can be also extended to the others media fields.
I had the same issue with a client who didn’t think of deleting the image in order to select a new one (or to upload a new one). I solved it by preventing ACF to hide the ‘Add new image’ button that is visible when no image is selected yet. If you have an admin.css stylesheet just add this: