I'd give feedback. If I still had my bakery, I'd want to know if someone was disappointed in a purchase for whatever reason. But, I'd suggest using the "sandwich" technique to deliver it - sandwich the hard part between two nice comments. In other words, lead with a positive ("the designs were lovely"), then deliver the feedback ("but I was disappointed with the flavor; I'd love to have tasted more of this or that"), and close with a positive ("Again, such beautiful work. I wish you much success." Or whatever you feel comfortable saying). People find it easier to internalize and act on feedback if it isn't delivered as a torrent of negativity.