1) Make it FABULOUS: Add a unique vase, platter, artwork or pillow if it excites you when you see it. Fewer pieces in a larger scale work well.
2) Be sure it's USEFUL. Candles that you won't burn are pretty, buy the lamp instead.
3) Is it NECESSARY? If your selection adds a fifth item to a group but really doesn't call attention to the design, then don't add it.
|Symmetry in design|
Good accessorizing uses balance, scale and form, among basic design elements, to add a finishing touch to a space. There are many 'rules' that have been developed but design is not about rules. DO make the items you display special for you. Vary the height of pieces on your tables and mantle for visual interest. DO consider using accent colors rather than the same ones in your furnishings. One truism...symmetry is great for traditional and formal spaces - such as buffet lamps flanking a large platter - and asymmetry is more casual; be sure the scale is balanced in your grouping.
On an accessory shopping trip it helps to bring color samples with you and certainly photos of the space you are working with. HAVE FUN!