What would be the cardinality between Artist vs ArtWork vs Group?
<blockquote>
  <p>You set up a database company, ArtBase, that builds a product for art galleries. The core of this product is a database with a schema
  that captures all the information that galleries need to maintain.</p>
  
  <p>Galleries keep information about artists, their names (which are
  unique), birthplaces, age, and style of art. </p>
  
  <p>For each piece of artwork, the artist, the year it was made, its
  unique title, its type of art (e.g., painting, lithograph, sculpture,
  photograph), and its price must be stored.</p>
  
  <p>Pieces of artwork are also classified into groups of various kinds,
  for example, portraits, still lifes, works by Picasso, or works of the
  19th century; a given piece may belong to more than one group. Each
  group is identified by a name (like those just given) that describes
  the group.</p>
  
  <p>Finally, galleries keep information about customers. For each
  customer, galleries keep that person’s unique name, address, total
  amount of dollars spent in the gallery (very important!), and the
  artists and groups of art that the customer tends to like. </p>
  
  <p>Draw the ER diagram for the database.</p>
</blockquote>

<p>Is the following ERD correct?</p>

<p><a href="https://i.stack.imgur.com/Orf6m.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Orf6m.png" alt="enter image description here"></a></p>

<p>Is it possible that a group has zero Artworks?</p>

<p>Is it possible that the Artist didn't produce any artwork but still sits in the database? </p>