My guess it's poured fondant - but......somehow made thick so it can be rolled out. Just a wild guess. Have no idea how to make such a rolled/poured fondant!
Could it possibly have clear gelatin poured over it? Not even sure if that is doable but when I blow the pic up it looks as though it has a clear coating of something.
That's not a cake, it's glass.
The flowers and side swirl could be done in pulled sugar. I wonder if that top 'cake' could be done in blown sugar.
That's funny. (Good catch, AZ)
You can also get a shiny effect on very smooth fondant by brushing it with melted shortening.
you wont be able to get a cake looking like that glass object, all you can do is say to the customer that you will use that as inspiration, but it will not be exactly the same.
Thanks to all
How did the cake turn out?