Release year: 2001-2010. This film about a man, who is a painter (not professionaly, it is his hobby). He met a girl (with blonde hair) and fell in love her, but she didn't. Then he asked girl's sister (or maybe her best friend, I don't remember) to help to gain this girl. She helped him and then fell in love this man. He didn't paint all that time because he thought that his sweetheart was his muse. I remember the end of the movie. He was painting the wall with children. Sister of his sweetheart came and said: - "Are you painting again?" -"Yes. because i found my new muse". She disappointed and ran away. But then he said about a muse he meant her.
Sorry for this short memoirs, I hope that you will help me :)