Erus, I'll have several different leather tuts put together in this thread. This is number One: Luscious well kept leather.
Base coat. Tzeench bless Foundation Paints
Now here is the tricky bit. This colour is very deep and the only word to describe it is luscious. Red Gore, Chaos Black and Snakebite Leather in roughly 5:2:1 mix.
simple blend into red gore and highlighted with Blood Red.
Lastly, to get that shine that you only get when you've cleaned and polished leather...
PVA Glue.