There are three types of flower designers _ designers that create arrangements based upon following floral design recipes which others originally created, those who create custom_made flower designs for each order, and those that can do both. It is not a given that the judgement will be good for each of these types of designers. However, the judging really comes down to whether or not the resulting design is liked by the customer and fits with their preferences. Since each type can receive positive feedback on their designs, it really doesn't matter which one to choose to become. It will come down to how much creativity and artistic license one prefers to exercise as the same excellent customer service skills are required for each type.
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.