Here's what we know:
* Size: Lucy was relatively small, standing at about 3 feet 6 inches tall.
* Build: Her body was likely lean and muscular, adapted for climbing and walking on all fours.
* Facial features: It's impossible to know her exact facial features. However, based on other Australopithecus afarensis fossils, we can infer that she likely had a protruding jaw, a flat nose, and a small braincase.
* Hair: It's not possible to know for certain whether she had hair on her body, or what color it might have been.
* Skin color: We can't determine her skin color either, as it doesn't fossilize.
Overall, Lucy's appearance would have been quite different from modern humans. She would have looked more ape-like than human.
It's also important to note that Lucy's appearance represents just one individual. Other Australopithecus afarensis individuals may have looked slightly different, just as people today vary in their physical features.
For a visual representation of Lucy, you can look at reconstructions created by paleoartists, but remember that these are based on scientific evidence and educated guesses.