Most of the paintings I create the edges have been painted so you don’t require any framing like below. All the painting have been applied protective layers to protect from dust as well as from ultra violet rays.
For gallery wrapped canvas which has 1.5” depth or the standard canvas which have .5” depth both type of canvases look elegant with a floater frame like below.
The art created on paper needs a frame either with a mat or without a mat. The paper art should go under a glass.
The art created on unstretched canvas could be frame exactly like art on paper, however it doesn’t need to go under the glass.
Some art which are not standard size can go under double glass floater frame.