As far as parasites go, you will not be able to see them. Generally, the biggest colony of parasites will remain inside your snake - the only thing that comes out in the fecal matter are eggs, which are too small to see with the naked eye. If you happen to own a nice microscope and have your own slides, I'd be more than happy to explain to you the best way to do your own at-home fecal flotation, but it really is best left to vets! (It happens to be one of my daily tasks at work lol)

Consistency and color - you want to make sure each part of the poop is just right. There will be some clear fluid with the poop, that is normal - it should be either clearish or a bit yellow in color. There should be some dark brown matter too - this should be hardish and well-formed. You should also see some white chunks - these should be either plain white or off-white, and should be well-formed but softer than the brown parts.