Repetition of colour, line and shape make for a clear, defined and easily read design and layout. The rounded shapes give the image a characterised cartoon style and feel. Combined, this creates a high quality vector based graphic.
I love the combination of the wine and the saxophone in this poster. This is a great example of a minimalist design with a double meaning. The saxophone represents the "Jazz & Blues" and the Pouring wine represents the winery where the even is being held.