Facts about this painting
start by analyzing the artwork,
1. is this a drawing, painting, sculpture, etc.?
2. is it a landscape, figurative, portrait or stilllife? (or other? )
3. what media (materials) were used to create the artwork?
next analyze the artistic techniques used by the artist,
4. what areas or focal points draw your eye, or grab your attention?
5.do the colors work with each other?
6.has the artist used all the space on the picture plane? (did they draw big
7. what ideas or feelings do you think of when you view the work?
8. does it tell a story, or is it primarily a study of something realistic

Explanation:

I googled what the story was so here that is in case you're interested: This poster advertised the play Lorenzaccio, written by Alfred de Musset and performed in Paris in the 1890s. The character of Lorenzaccio was based on Lorenzo the Magnificent, a member of the Medici family who ruled the city-state of Florence in the Renaissance period. The title role was played by the actress Sarah Bernhardt, and it is her figure that is seen in this poster. She is dressed in a sumptuous black period costume, with a dagger hanging from her belt, holding a book. Lorenzaccio is lost in thought, pondering how to save Florence from a power-hungry conqueror. The conqueror is represented by the dragon at the top of the image. The muted colour palette of blue, gold and black, combined with the long lean lines of the image, make this poster a typical example of the period and of Alphonse Mucha's work. Although Mucha resisted being labelled an Art Nouveau artist, this print fits into the Art Nouveau style.

i got this answer from a really friend, and it was right.

hope this you like it me and a special to that dude!

artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.