We call it Semitransparent Acrylic Portrait Frame because it is made of semitransparent materials, the highlight is that, it has a cambered surface which is different from the ones have flat surfaces.
These are just for reference, appreciate your own designs.

Acrylic Display Commercial Frame Usage: Bedroom, Sitting Room, Dormitory, Birthday Gift, Promotional Gift, Boutique Shop, etc.

Features:

1-Material: High quality Acrylic+magnets.
2-Size: 190X20X80mm
3-Thickness: 10mm .
4-. Workmanship: CNC Cutting, Cloth & Flame Polishing, Drilling.
5-Welcome customization