As you see, O Henry's manner of writing is realy unique. Of course, sometimes it is not so easy to understand the content and hidden hints within the setting of the events in the story. With the help of using various stylistic devices the author's short story becomes emotional, intriguing, cheerful and passionate. 
   Detailed way of portraying the main characters and their feelings or actions reveals either positive or negative attitude of the author. For sure, O. Henry tries to stir the imagination of the readers and stimulates them to make their own judgements. That is why he tends to use a great number of stylistic devices in order to:

• show how good - looking, industrious kind - hearted the main heroine Masie is; ("For Masie was beautiful. She was a deep - tinted blonde, with the calm poise of a lady who cooks butter cakes in a window. She stood behind her counter in the Biggest store; and as you closed your band over the tape - line for your glove measure you thought of Hebe*; and as you looked again you wondered how she had come by Minerva's*  eyes.")

*Hebe is the goddess of youth in the Greek mythology

*Minerva is the goddess of wisdom and sponsor of arts, trade and defence in Rome

      ("That is the shopgirl smile and I enjoin you to shun it unless you are well fortified with calosity of the heart, caramels and a congeniality for the capers of Cupid. This smile belonged to Masie's recreacion hours and not to the store...)

 For describing this character O. Henry uses a great number of repetition, enumeration, epithets, similies, exclamations and antonomasia. So there is no wonder that the author expresses great delight towards Masie and put emphasis exclusively on her positive features of character.

  However, at the end of the story we see this girl as an experienced one who really knows how to behave with men and that they are not creatures she can rely on. Masie assures her friend Lulu that they are all the same, and Mr. Carter is not an exception. When Masie ia asked by Irving to marry him, she does not take it seriously; the girl believes that his promises to take her to far - away countries only mean that everything he wants is to get married 

( he is already 29) and go down to Coney island for a wedding tour. So we can make a conclusion that closer to the end of the story Masie exposes a little bit different side of her perconality, that is сapricious and even childish.

• reveal the character of Irving Carter; ( "One day Irving Carter, painter, millionaire, traveller, poet, automobilist, happened to enter the Biggest Store. Filial duty took him by the collar and dragged him inside...")

  Describing this male character the author uses epithets, enumeration, anaphora, polysyndeton and periphrases. 

("And then Irving Carter, painter, millionaire, etc., felt a warm flush rise to his aristocratically pale face. But not from difference. The blush was intellectual in origin.")

( " He didn't know the shopgirl. He didn't know that her home is often either a scarcely habitable tiny room or a domicile filled to overflowing with kith and kin.")

   For the first time the author represents Carter as a welthy honorable man. On the one hand, it is clearly that he has a wide rаnge of interests - poetry, travelling, art and cars, though we have no idea about the way he gets his money. But still he is used to spend them however he wants. 

   On the other hand, emotional state of this character changes greatly when he notices at Masie for the first time. Their eyes met in the Biggest store, and from that first sight he fall in love with Masie. Self - assured and respectable 29 year-old man at ones turnes into shy and decent teenager. He is afraid and uncertain to say a single word to the subject of his admiration. But still when the young girl agrees to have a date with him, Carter's сonfidence comes back and he even expects to сonquer Masie's heart with the help of his money. The man gives promises to visit abroad places and spend great time together. His feelings and intentions towards a young lady seem to be sincere, however she does not believe him and refuses his proposal as for the marridge.

   Making a conclusion I would like to mention that both Masie and Irving  have positive and negative traits of character. Still, the author described them in such a way that we can either condemn or support them. Wide usage of different stylistic devices helps us to understand and empathize the main characters of the story.