Updated: Apr 27, 2020
When you have to decide on a mat, be generous.
A large mat can make a big difference to the final outcome, so take it seriously :-)
Below you see three mat sizes and how the same print looks.
There's also a photo from my living room wall, where two prints are shown with really large mats. (Actually, the bigger one is just a frame and a print centered and glued on the wall, but this is a different post I'll be making soon here).
You can also search Pinterest boards and get mat - ideas before you frame your prints!