My little sister's wedding cake

My brother-in-law had a friend paint a sea shell asking my sister to marry him, and when they were on vacation in Florida he secretly put it down when she wasn’t looking. She picked it up and BOY was she surprised. So when I made her cake…I wrote her answer on a chocolate shell. When I made the shells I didn’t have any way of adding any color to them so I took the outer chocolate shell off of some peanut M & M’s and used that. This was also the first time I have ever done anything with fondant….