Source: Instagram @dirty.copy
Some of these were really interesting - like adding rounding to your buttons. I still choose the amount of rounding based on the client or campaign branding and what matches best, but now I try to always add at least a tiny bit of corner rounding instead of keeping it at a perfect 90 degree point.
This is also a good idea for all of your imagery - always have the person facing the direction you want readers to read next, not towards the outside/exiting off of the page.
