Thanks so much David this was my first try and I was pretty pleased with the out come.
I got pulled away before I posted this last pic.
We made 6 castings, 5 of them were portadora alocasia leaves and 1 was castor bean. The castor bean I did a large shallow bowl shape with the leaf impression. One of the Portadora was done much the same way with plenty of concrete around the leaf. The other ones the concrete followed the leaf edge. I will be using several of the Portadora castings for a water feature. Three of them are a good 4ft long the smaller two are 3ft long.