If you scroll through the images here, or at NASA's JunoCam site, you'll see a mix of heavily- and lightly-processed ones. Some of 'em go overboard to my taste but others, while still obviously processed, IMO look great nonetheless. I like this latest one a lot…the high contrast reveals atmospheric structure that's otherwise easy to miss.
The storms are very much that: hurricane/cyclone-like systems. Jupiter does get hit with plenty of asteroids and meteroids along with the occasional comet, but when they leave visible traces it's typically in the form of dark "bruises" as with pieces of comet Shoemaker-Levy 9 in 1994.
-Dave-