This video shows how we tackle this task.
Artwork is usually held flat by the glass in a frame, but kept away from actually touching the glass by the window mount.
As an alternative, artwork, especially work on bumpy media, may look better stuck down to the back mount and then with the glass kept away from the artwork by a “fillet” (or “spacer”).
When this is done with a deep frame, then the artwork can be held to the back of the frame, which can look very effective.
The uneven paper leaves shadows and these become a feature, you can can see the quality of the
The video below shows how we do this at Inspirations Framing.