In some versions of the story 'The Happy Prince', there is the following ending. After the sad fate where the happy prince's lead heart and the dead swallow were thrown in the city dump, an angel was instructed to go to the city and bring back to heaven the most precious thing it had to offer.
The angel flew to the city dump and retrieved the body of the dead swallow and the broken heart of the prince. When the angel returned, he was told 'you have chosen well'.
I've decided to draw the scene where the angel retrieved the bird and the heart. In this piece, I've intentionally drawn the angel dirty to reflect how precious he believe them to be even wrapping them carefully in his own robes