What happens with the wood carvings that causes them to crack, is the rapid change in humidity. Going from 100% humidity to probably around 20 to 30% in the US when we have our heat on in the winter. If you allow the wood to gradually adjust to the change in humidity, it will not get the cracks. This can be done by placing the wood in a plastic bag with a couple slices of apples. The moisture in the apples gradually replaces the loss of moisture in the wood. After the wood absorbs the moisture from the two slices of apples, replace with one slice. When that moisture is absorbed, the wood should be able to handle the normal invirenment of your home.