Adding fine casting plaster

I decided to add casting plaster on the top of the already one coat plaster as i wanted a smoother look. The one coat was harder to sand down so by coating inlt in the fine casting plaster by just throwing it over in a jug it already gave it a much softer look than before, all i need to do now is wait for it to fully set so i can get to sanding it down then add paint.
Im planning on using a plain colour and just adding shadows and highlights but very subtlely.