Questions about 36ct fabric; plys of thread & bead size?
Both your fabrics are very pretty. If you have a big enough piece of fabric I would mount the finished piece using a pre-stretched artist canvas. (Think modern paintings where the artist paints the sides of the pre-stretched canvas and then doesn't surround the piece with a frame).
Your painted fabrics are certainly lovely enough to be displayed over the sides of a pre-stretched canvas.
I have only used 1 over 1 on parts of pieces that need very detailed stitching, such as faces or hands. I wouldn't even consider doing an entire piece in 1 over 1, unless a miniature.