interestingasfuck

They basically remap wavelengths, so yes, absolutely those would be representative of real features, either in the atmosphere or on the ground.

That said, absolutely, sometimes there's a bit of artistic license in how the wavelengths are mapped.

Edit: the space.com article on the image describes some of the physical features depicted:

https://www.space.com/james-webb-space-telescope-saturn-moon-titan