To most of Tatooine, they're only a typical band of travelers. Dusty robes, sand and dirt and grease, particularly on the Gungan; weary under the hot suns; looking down and trying not to be noticed.
If you were a little more observant, you might notice that something is off about this group. That the bearded man carries himself with the stance of a warrior, that when his robes are at just the right angle you can see a silver cylinder hanging from his belt, with the intricate mechanisms of a Jedi lightsaber. That the Gungan, when not tripping over his feet, is staring at the man with a stare of admiration, a look that seems to say the man had done something for him that he was desperate to repay. That the astromech, beneath the sand, is made of the finest metal, fitting the exact design of the Naboo royal droids. And if you were particularly knowledgeable about the workings of the Naboo, aware of things that even the Jedi Master hadn't noticed beyond a vexing sense that something was off, you might notice that the girl in the handmaiden's robes very closely resembled the queen Amidala.