I'm guessing this person didn't have the time or didn't care to take the time to explain why they didn't like the cake. It was rude. It's easy to misunderstand the message someone has written with out the expressions and tone of voice. With this, I will try to be careful how I word this.
I want to say up front you are very talented. I will have to take the time to see if you have other work posted. I will admit, my personal taste, I don't like the cake. The green is too dark. I can't seem to put my finger on it but there is something about the drapery. I do love the bow. I think it would have worked better to put the large drapery on the bottom layer and eliminate the ruffle coming from the top of the drape. The drape on the second layer maybe narrow it and allow more crease.
Now, I have to be very honest with you here. This cake is unique there are going to be people out there that will love it. But, I don't think the majority will and that will be a reflection on your work. It's good to have a picture of a cake that is out of the box (pardon the pun) that shows you can do something for the bride out of the ordinary. Then again you want to have one that will attract the taste of the majority. This can be hard.
Going back to the color. I ordered colored fondant for my Grand-daughters Baptism cake. Wow, it was a dark, dark, pink. I mixed with white and lightened it but it was still too dark. With no time, I had to use it. The cake was beautiful but when my daughter walked into the hall she said; "Wow, that's really pink". I was pleased with my work so I couldn't dwell on the color.
A note on individual vision. I can see the frame of a house, nothing but 2 x 4's and see how the house will look finished. Others will only see wood nailed together. If I was a bride looking at this cake I would see the talent and have the vision of what it would look like with a few changes. But, so many can't.