This postcard sent by Heleen (the Netherlands) makes me think of Autumn. It is De Zaaier (='The Sower', 1888), by Vincent Van Gogh, belonging to the Wheat Fields series.
The sender chose this postcard for me because, among the 60 Van Gogh stamps that PostNL has issued this year, it was the only one that matched her booklet of postcards. Yes: Van Gogh painted a lot! Anyway, it was the perfect choice, because I really love the colours on this postcard/stamp.