Rather than fiddling with the humidity of the entire enclosure you could create a humid hide: Take a plastic container or box and cut a hole and then add moist substrate inside. Try to place it in the 'ideal temp' zone of your enclosure (80-82F). Ball pythons prefer snug hides--usually you start out small and then increase the size of the hides in relation to the size of the snake.
Also, it looks cool, but, make sure that skull decoration doesn't have sculpted closed loops that are small enough to catch your snake-if it does--modify it, or remove the decoration. We have seen many photos of ball pythons with their bodies trapped in various fish tank decorations...
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