make your admin images and icons svg/high-res/retina-ready
Your frontend and admin www all use low-res images/icons. Lets see some svg!
Most high-end IT departments have higher-resolution 4k+ laptops/monitors -- my clients are fickle, and notice things like low-res images/icons. It obviously doesn't really matter, but it makes your service look more amateur than pro.
Help us sell your stuff to high-end peeps -- get higher-res!