1. Pulling her pants down. This is something I really like to do myself. The act of unbuttoning is the BDSM equivalent of unwrapping a gift. Which I guess it is.
2. Grabbing the hair. You know, when you grab someone's hair, you have their attention. If you are wailing on their ass while doing it, then you have split their attention in two places. Besides, good hair was meant to be pulled.
3. When the ass is bright red and hot to the touch, I like to lean down and bite. I like the feel of hot skin between my teeth while the person I am biting either squeals, moans or shivers. I like to bite right where their cunt is inches from my nose. If I am doing a good job of spanking, I can smell just how good I'm doing. When the skin I am biting is no longer blistering hot, I know it's time to go back to the spanking.
Feel free to add to the list.