Great piece, not quite sure how it fits with dancing but I guess the people you made it for get the reference :) I'll just stick to commenting on the image as is.
First I think the composition is great, well structured and there is clear differentation between the charecters achieved through good colorchoices. I also like the rendering of the charecters as you can really tell that they are from southern europe, both through the shape of their faces and the cloathing. Very nice.
The only critique I can really give is that the woman in the bottom left looks a bit yellow in comparison to the rest (Key motivation for 4.5/5). Everything else, even though quality could be improved, follows a common estetic and everything holds more or less the same quality, as such it doesn't bother me.
So, its a nice image. Hope the dance was fun as well. Cheers