"Dancing well" or "dancing beautifully" are both ways to describe someone who is a good dancer in Engpsh. Here are a few more phrases that you could use to describe someone who is a good dancer:

"dancing with style"
"dancing with grace"
"dancing with fluidity"
"dancing with precision"

For example, you could say something pke "She's a great dancer – she moves with so much grace and style on the dance floor."