How can you tell a good agent? Look at his portfolio, the brands he represents and if he has represented some of them for a large number of year this often indicative of a good agent. You should not assume that agents with large portfolios will not look after and sell your collection; nor you should assume that's small agencies won't have the right kind of connections. Very often is a synergy between you and an agent that will make it work. Often newly established agent who have had many years of experience working for others are very ambitious to be successful.