One of my biggest struggles right now is drawing hands. They are the most awkward, strangely shaped blobs. I sketched this a few times during the day, so I had a solid idea of what needed to be done. I realised after-the-fact that I forgot to add a credit card to the bottom of the pin pad so you can tell that is is not just a calculator, but a credit card thingy.
Either way, there will be plenty of awkward hand images to come.