Esther, the anonymous singer who dreams of having a hit record, is seen mostly in dark blue. She's backstage, amused at the ruckus being caused by drunken movie star Norman Maine. Maine is played by the under-appreciated James Mason at the top of his game. Maine, a headache for the studio publicist, is scheduled to be a headliner at the Shrine Auditorium benefit. Esther remarks to her friend, the band's pianist and musical arranger, "Mr. Maine is feeling no pain." She will save Maine onstage.
I found this scene on YouTube and I hope it stays posted. Norman tells Esther to make her dream bigger. Cukor shows us a more respectful Norman by having the door open. Notice that, as Esther starts talking, we see a trickle of water through her window. It's from the pathetic little fountain in the courtyard. In the composition of the shot, water is between Esther and Norman. As he tells her, "Don't settle for the little dream, go on to the big one," we'll see that trickle between them when they sit at the fountain. The water is between them as he wants to take another look at her before they say good-bye.
Cukor got two of the best performances in Hollywood films of the 1950s out of Garland and Mason in A Star Is Born. The film itself is one of the director's cinematic peaks.