The lowest new price for a Kenny Hill New Player offered by a reputable dealer looks to be $1525 before tax and shipping. It looks to me like used guitar sell in average condition for about 50% of a new identical (or comparable) model.
Now, the cracks will decrease the value of the used guitar as they may decrease the cosmetic appearance and buyer's enjoyment of the guitar and increase the difficulty of reselling the guitar later on.
My experience is that a used guitar with repaired cracks may have to be sold at 30-35% of the price of a new comparable guitar. So if I were selling this item, I might list at $650-700, gradually drop the price in increments of $50 if there are no viewings, and sell on any offers above $475.
Hope this helps. Good luck!
"I love the guitar for its harmony; it is my constant companion in all my travels." -- N. Paganini