I used paper clay did all these some of them I keep it for more than 5 yerars and it still in good condition. How long can your paper clay creations last? it all depand on the moment you make it. Let it dries completely before you paint and I think this is very important step.
As time is limited in class so I have to paint when it is only half dried.
I always tell my students to parctise at home and paint after it completely dried. You will find the different .