If you have purchased original or limited edition artwork, you need to shape it properly so that it extends the life of the artwork, not shortens it. Art is an investment, as is framing. So when you know the method, you can be sure that it will be done right.
Selected pads and frames should not overload the artwork. The framed canvas art is the focus and framing should complement it. When you walk into a room and the first thing you see is the frame and base, you need to rethink your choices. Never design art to match the decor of your room. Your décor is subject to change and the art will always suit any room if framed properly. Personalized framing is all about finding the right one for your artwork.
If you are framing paper, make sure it is framed with an acid-free pad or rag. A standard mat can burn your work over time and lose its value. You don't want that to happen. There are thousands of mats and frames to choose from, so there's no shortage of options in the acid-free range.
In general, two mats are better than one, and in most cases, a third one looks fantastic. If you have art with edging, you might want to show it off because it's so beautiful.