Along with the overall dimensions of furniture, art, and mirrors, here are some additional tips to consider if the vignette you chose will work in your space.
1. Have a closer look at the depth dimension.
Consider if there is ample space for your body to move around and utilize the space. Furniture depth + body = 25" to 30" is sufficient.
2. Ceiling height.
Typically, the standard ceiling height is 8ft, when placing art or a mirror above your furniture, a range of 5"to 10" above is appropriate.
3. Consider the width dimension.
To avoid the vignette from looking like "it was shoved into the space," have at least 2 1/2" to 3" of space on either side of the wall where furniture is placed.