I was browsing some blogs and found a really good idea for working out where shading should be on your image when colouring. It's super easy and all you need is some acetate and a permanent marker with your stamped image. I even made one for my 10 year old that loves drawing and colouring and it has improved his work as well.
It was written by Anice from Funkyhand and posted on the Get funky and craft blog. I hope that It will help you as much as it has help me. Have fun Colouring and thank you to Anice for sharing her great tip.
You can find the tutorial here.