i think it depends on your skill too, if you are not that trained in making Sugar flowers i would charge less. I just recently made some orchids for someone, i charged 50 euros for it because i wasn’t sure about myself. Now i would charge more because i have a little more experience. I made 4 normal orchids, 3 smaller ones and 3 buds. I charged by the flower instead of by the hour.
You can look also on etsy what they ask for a Sugar flower so you know what a average price is.
carpe diem