Creating floral designs that catch a viewers eyes is a skill which good flower designers have. Just like an artist who creates a piece of artwork that captures the viewers attention, the florist needs to be able to create a design that pulls a viewer into a floral design. When pullled into the design, the viewer experiences something that must be good about the designer. It will help them to think positively about the designer.
To get a beautiful flower design or an arrangement, you don't need to show all of these three. The most important here is that your design has ornamental flowers; you will still get a terrific and an artistic flower arrangement.