Hehe... nicely done! Technically spot on, works very well!
Artistically I feel there's a couple of things that could be emphasised to make the piece read a little better. I guess it's the animator in me but I feel like the characters (or characterisation) could be pushed more to make for a better contrast.
For example let's say one girl is the party chick who likes to play so you have three of her looking hot, holding drinks or surrounded by bottles (and hitting a bong
) but you'd have her sister sat looking really dowdy dressed plain (because that's how the other one sees her)
Then in contrast you'd have the 'plain' girl with the rubbish bags and mops etc looking angry at her socialite sister as she types on the computer and chat's on her phone.
Perhaps you could explore the characters more... not just have one of the girls with the cleaning stuff and looking angry... perhaps she is the more intellectual of the two and has an interest in books or study etc. But with each one of the 'stories' you tell it may be fun to push the idea more... So if she's sporty, don't have just a single football... have lots of stuff, like a tennis racket and hockey stick (or whatever sporting stuff u can find heheh)