It is given as 'Private collection'.
It depends on what media the artwork is. For two dimensional and digital pieces (and maybe three dimensional, I'm not 100% sure), there is a website called deviantART where you can sell your artwork as posters. You can also auction your artwork on eBay if you request a reasonable price.
A book or collection of maps is called an atlas.
Provenance- origins and ownership
Restrike Etching created the Moonrise.
Meredith Lea Bailey's personal collection of fine artwork is only available to private collectors worldwide.
a portfolio
The arrangement of objects in an artwork is called the composition. It refers to how elements such as line, shape, color, and texture are organized within the artwork to create a harmonious whole.
Artwork
It is given as 'Private collection'.
At collection of stamps is refered to as a stamp collection. They are frequently kept in albums. Philately is the name for the study and collection of stamps.
Cecil Keeling has written: 'Collection of original artwork, engravings and proofs' 'Low company'
a collection of fish is called a school of fish
it is called a range of mountains
fetch boy fetch
Oh yes.
A collection of sayings is called a "proverb" or "aphorism."