Hands can be hard to draw sometimes. Handshakes can be even harder. Mainly because you can't shake hands with yourself to see what a handshake really looks like! When doing live graphic recording, there's no time for that anyways. You just have to draw!
Here are nine different ways I tend to draw handshakes when graphic recording. I've found it really helps to have a number of different ways to draw something - some super simple, some more complex. That way, if you only have a few seconds to draw something, you've already found a way that works.
It's also good to do experiments like this behind closed doors, instead of waiting until you're standing in front of a big bunch of people or on stage!