P.S. Sorry for the poor quality of the picture, but didn't have the chance to make it look better, closer to the original, which colors are more vivid and there's more depth to it. Still, you can't deny the image beauty. I only added the birds.
Here I used coloured pencils-Koh-I-Noor(plus watercolour ones) and Faber Castell, some White Koh-i-Noor Ink and Schneider topliner 967-black.