Reaper ProPaints makes a color called "oiled leather," that I like. I was very dissatisfied with the "leather" colors offered from Ral Partha paints. As for Citadel paints, I have them, but I still like Reaper's oiled leather the best. It's worked well for me so far.
Black is the simple way to go, but I usually restrict it to boots, gloves, and belts for aggressive looking character figs. Add a touch of gloss, but not too much, to give a shiny look.
If you visit Games-Plus, they have Vallejo paints there! Vallejo offers a red leather color that looks nice. Vallejo offers glazes, satin finishes, and other nice touches that the other companies simply don't offer. Be sure to play around with them if you get the chance.
I like to use the red leather for female figs. A red leather accent to a chainmail clad lady can be striking. Vallejo's red leather also won't be confused with blood, which seems like the only red color most other companies seem to make.
If you haven't tried this yet, try outlining the fingers and buckles and boots of your figs with a thin black line. It will help separate the items from each other, especially if they are right next to each other. Actually, you should outline everything if you do it at all. This alone might help you be able to better see the different items on your figs.