Let’s look at eyes. Two is handy for 3d vision but let’s have them on the side of the head so we can see behind us as well as in front. They’re delicate so we need a nictating membrane. We’ll make it transparent so we can still see while protecting the eyes. And stronger muscles so we can change the focal length better and so that we don’t lose short vision as the muscles get older. And two or more foveas so we can see more detail at greater distances. And an ability to see a huge range of wavelengths including infra red and ultra violet. And a mirror layer behind the retina and as many rods as we can fit in (we’ll make the eyes very large) so we can see in very low light conditions. Plus a larger retina. And a separation of the cornea from the lens in a way that will allow us to see clearly underwater