Triptych, Goth photo frame

Triptych - photo frame is made of plywood and hand painted with black varnish. Edges left in natural brown-burnt colour. It's composed (as name suggest) of three pieces.

Photos need to be attached to the wooden panel with double-sided adhesive tape, or tack?

Triptych is designed to stand on a flat surface with side panels at a slight angle to the centre panel. It will fall over when all panels are in line.
When closing the triptych side panels will form sort of a triangle instead of closing flat - it's designed this way in order to make sure that it won't be toppled over easily.

Dimensions overall:
Width: 38 cm = 15 inches
Height: 48 cm = 18,9 inches
Thickness: 1 cm = 0,4 inches

Dimensions of middle panel:
Width: 15,8 cm = 6,2 inches
Height: 31 cm = 12,2 inches

Dimensions of side panels:
Width: 7 cm = 2,7 inches
Height: 25 cm = 9,8 inches

*photos not included*

**Item is not water or weather -proof, Pictures are taken in the forest because it's a beautiful scenery**