i was disappointed in my cake, how do i tell my baker?

I worked in a specialty bakery for 5 years. Bottom line is you paid for a professional cake and received a novice's work. The diameter of each tier is wrong, the structure is off center, the icing and sprinkles are not what you asked for, and the flowers are poorly placed. I would absolutely demand a partial refund and also let the vendor who recommended her know so they don't misguide another couple. I am so sorry this happened, but you are absolutely right, the most important thing is that you and your spouse took vows with the most important people to you to witness and celebrate. I still think you should be refunded though.

I wonder if the baker mixed up your photo with someone else's? It's not normal to have tiers the same size. Maybe another bride wanted a "tower" look. And different colors.

I would definitely let the baker know that you were not happy. And as another poster suggested, let the vendor know that recommended them. After I worked with a "5 star rated" real estate agent who was awful, I no longer trust generic ratings. But a vendor? I would take their word, so it's important to let them know what happened. Their recommendations reflect on them, in my opinion!