To dream that you are buying artwork, suggests that you are willing to work hard and are able to follow directions. However you lack leadership abilities.
To dream that you are selling artwork, represents your ability to express yourself and your beliefs.
The person, place, or thing shown in the artwork, or a special focus or thought about them
A remote or distant feeling regarding what's in the picture, perhaps a feeling that it is unattainable
An expression, opinion, belief, etc.
Creativity
For more clues to meaning, consider the subject portrayed, the context of the piece, and how you feel about it.