There are florists that are amazing flower designers and they don't have much previous experience _ they possess natural talents for creating beautiful designs and receive positive feedback on their design. There are others that require instruction and training before being able to create fabulous designs and receiving the good feedback. For those who fall into the latter case, the designer should seek out and take training classes as well as locating potential mentorship possibilities. Together these will help the person to enhance their skills and increase the amount of good reviews they receive. Also those in this latter category may do best, at least in the beginning, working in a designer position that follows recipes or formulas.
The judging of the designers work is extremely subjective. Each person that sees the design will make their judgement based upon personal preferences for design styles and flower choices. There is no set of common criteria used in making decisions about whether a person likes or dislikes a floral arrangement. In fact, there is not a standard criteria list which is used by everyone. To further convolute matters, judging actually comes from more than just one or two people _ they come from the recipient, the customer who placed the order, and third party observers (anyone else who sees the arrangement). Therefore it is virtually impossible to please everyone with each design that is created.