The artist is Allen Shaw, a Berlin-based Indian artist, illustrator, and storyteller and animation filmmaker. Every year, he does a series of illustrations in autumn. Inspired by the current season this year, he decided to collect leaves, photograph them, and then add watercolor illustrations to express his love for it.
He essentially uses watercolors, but for this series, he used photography as the base. After clicking the images, he studied the character of the compositions and then started doing the figures that fit the context of the photos. Glad you enjoyed it. The one above is titled, 'Play Me A Lullaby'.
I love his work, too.

Here are a few more just for you.
Autumn Ballet
While You Graciously Fall, I Try To Keep My Balance!
Peter Pan
Six Strings
Autumn Surfing!
Marilyn Are You Watching?