The E-Ink picture frame comes with a glass pane by default. While this protects the display, it can also cause distracting reflections. If you want to enhance the paper look and improve contrast, you can easily remove the pane: no tools required.
Here's how to proceed:
Place the frame face down.
Press the clamps on the sides open. Caution: The edges can be sharp! Only touch them at the folded part to avoid cutting yourself.
Remove the cover of the battery compartment.
Lift the back panel of the frame.
Carefully pull out the small wooden strips on the sides.
Take the entire unit out of the frame.
Now you can remove the glass pane: it is no longer needed.
Reassemble the frame in reverse order.
Done! Your E-Ink picture frame is now even more paper-like :)
And here it is again as a video.