Contrasting the pool and paintings. Neither picture is the same pool as the one in the photo the tiles are too big and square in the artwork. The pool painting that has blue tiles may or may not be the same pool in both drawings. Situation of the children (pool+blue) suggests a bigger pool or at a deeper end. Children's uniformity in under clothing (pool+blue) (Under clothing is identical) suggests they came from the same location, likely a children's home.
Contrasting both drawings this is likely to have been two different events.