You're asking about the apparent brightness of Jupiter's moons as seen from the surface of Jupiter. Here's the breakdown, keeping in mind a few things:

* No Surface to Stand On: Jupiter is a gas giant, so there is no solid surface to stand on.

* Brightness is Relative: The apparent brightness of the moons would change depending on their position in their orbits and the angle of the Sun.

However, we can still discuss the moons' relative brightness based on their size and reflectivity:

1. Ganymede: The largest of Jupiter's moons, and also the largest moon in the solar system. It would appear significantly brighter than the others most of the time.

2. Callisto: The third largest moon, and generally darker than Ganymede.

3. Io: A very volcanic moon, Io would likely appear quite bright due to its active surface and the reflected sunlight from its volcanic plumes.

4. Europa: This icy moon would be the faintest of the four Galilean moons, as its surface is relatively reflective.

Beyond the Galilean Moons:

Jupiter has dozens of smaller moons. These would be extremely faint, and likely only visible with good optics.

Important Note: The apparent brightness of the moons would also be influenced by Jupiter's atmospheric conditions, which can significantly scatter and absorb light.