|*Greetings from the Critique Club*
I found this a pleasing image, especially this time of year.
Compositionally I like the one prominent subject, with less prominent subjects also in the photo. Had this not been a poster, the blank space at the top might have bugged me a bit, but it worked well for the poster.
Technically I think the image is quite good. The sun rays and yellow color of the sunflower petals are gorgeous, and I like the see-thoroughness of the sunflower petals. The green and blue colors seem true.
A dictionary definition of propaganda says information used to publicize or promote a political cause or point of view. IMHO this might be where the image is a bit weaker. The top images in this challenge almost did not appear photo-like, and most are at least clearly advertising something. The message in this image, while pretty, is less clear.