If I may give some additional pointers.
Don't rush your dye job when using multiple colors. The colors can bleed and they will bleed together and it will make you nice hard tooled edges muddy looking. After letting your dye set, burnish it with a soft cloth. Dyes can leave a residue on the top of the leather. I use an old cotton sock.
Get an antiquing gel or fluid if you want to make patterns stand out. You lay down the gel, and wipe the excess up and then lay a lighter dye on top. It makes all of the recesses darker.
Small modeling paint brushes are awesome for dying small parts. I use them quote often when doing custom leather work.
If Joshua is ok with others posting pictures in his thread, and if you all are interested, I can post a some carving and dying I have done to show other examples.