You can remove the image background within GIMP and make it transparent. You can create drawings on each frame using several tools like paintbrush, text tool, bucket fill tool, smudge tool ...

Transparent backgrounds for the products make more sense ... Select the Background tab on the upper left. The tool will then ...

You can also save it as a new photo with a transparent background. Although Canva is a free photo editing app, the background removal tool is one of its premium features and only available to ...