They look great OP, glass glare can be bad not just for photos of your work. Are you hand painting the frames? Do you hand cut the mats w/ a mat cutter, use a diff cutting method or use precuts? If you ship these you wll really have to be careful about glass breakage.
I know these are snap shots but,
for photos I would go ahead and setup a studio lighting sit since you know you will be photographing these. The flash does really take away from the whole piece, also the distortion.Also if you are shipping I would add some really nice personal touches in the packaging/wrapping. The whole alaska theme is obviously, a big playing point.

No need to think outside the box....
    Just make it invisible.