Help with an art sculpture?

I bought this Crayola Air Dry clay (it's shit I know) from hobby lobby and I'm wiling on this sculpture. But whenever I set a few of the pieces out to dry and they fully dried the surface was a lot more rough and dry. I've felt clay sculptures that were entirely finished and they felt smooth. Is there any way I can smooth out my sculpture permantely without changing the shape too drastically? And suggestions are helpful! Thanks(:
 
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