I understand that the original painting shows Christ’s right hand at a position below his shoulder.
What you see here is a modern verison.
Sorry those pictures aren’t all showing up. Here are the links that will put them on your page for a short while so you can view them.
http://our.homewithgod.com/divinemercy/images/threeclock.jpg
http://our.homewithgod.com/divinemercy/images/Apparition1.jpg
http://our.homewithgod.com/divinemercy/images/faustina_jesus_03.jpg