This phrase is a reminder that no matter how hard you try, it is impossible to make everyone happy. It is important to remember that not everyone will agree with your decisions or actions, and that is okay. This phrase is a reminder to focus on what is important to you and not worry
From Wikipedia
You Can't Please All is an oil on canvas painting by Indian artist Bhupen Khakhar (1934–2003). Khakhar, famously recognized as India's first pop artist, completed the painting in 1981 in Baroda, Gujarat. The painting took him five months to finish.