Hi Victoria,
Have you checked the smoothness of your mold ? If it is not smooth, it will transfer it's texture to the paper. The paper you use should be able to soak water, depending on how it's made, they have different abilities to do that, so always use a paper that soaks well and do some tryouts to find how long you need to let it in the mixture before applying to your mold. And you can soften the surface of your papier mache with fine sand paper.
Have fun