When a photographer use flowers bought from store in a scene everyone don't brother :it is an correct accessory
When in Poser we use flowers bought at Daz ,some say it is cheating ;you better use a 3d soft and model the flowers by yourself
I think  it is more important  the art of seing,  the creativity on composing scene and lighting, the story and sens of  the picture than the tools and accessories used for it