The One With All The Wedding Dresses - S4-E20
Visible crew/equipment: When it's Monica's turn to catch the bouquet she and Phoebe switch places, and just as Phoebe asks her if she's ready, in the wideshot studio lighting rigs can be seen at the top of the screen.
The One With All The Wedding Dresses - S4-E20
Visible crew/equipment: After Ross announces that he and Emily will be getting married in a month, there's a shot of Joey and Chandler, and when it cuts back to Ross saying, "Yup!" the reflection of the boom mic can be seen on the framed picture hanging on the bathroom door.
The One With All The Wedding Dresses - S4-E20
Visible crew/equipment: When Ross asks Rachel how she feels about him marrying Emily, several stage lights can be seen in the reflection of the TV during the entire scene.
Answer: The painting doesn't have a name, and if it does it is never mentioned in this episode.