Leather carving and tooling starts with an image transfer. This is a pretty boring task, so I accelerated it to run faster (on the video).
There are only few points that you need to follow to get it done properly:
1) choose an image with a lot of details – scars, irregularities, wrinkles – more details, more realistic end result you will get
2) case leather properly – wet it well, then wait till its original color starts showing up
3) use tracing film between the leather and the image – to protect the paper. Alternatively – print the image onto the tracing paper
4) tape the image and the tracing film so it wouldn’t move during the tracing.