But there is really nothing correct here, Saturn is a big ball of gas and its appearance changes over time, cloud belts can darken, fade, get wider or narrower etc. But still, renderings created from this model look very much like the photos from the Voyager spacecraft which is what I intended. You may notice that the northernmost cloud belt is not straight in the east-west direction but has a kind of wavy structure, unlike the other belts. When it is rendered it shows up as a dark hexagon around the north pole. This is not an error in the model, Saturn really has a hexagon around the north pole, one of this planet's most enigmatic features.
Latitudes are planetographic.
It should be rendered by projecting it onto an ellipsoid with an equatorial radius of 60368 km and a polar radius of 54362 km or some equivalent units. It is important not to use a sphere, this oblateness is one of Saturn's more distinguishing features and is for example easily visible in small amateur astronomical telescopes from Earth. See also my planetery rendering tips page for further info.