Hot diggity damn where do I even start?
The hair and the way it flows looks fairly natural (plus the highlights/lighting in general are very well placed). The clothes are so damn beautiful and the outfits themselves are complicated yet extremely neat! Some people tend to add too much stuff to their character's outfits just so they can be complicated but not you, dear ma'am! You managed to get them to look elegant enough by placing details (such as the detail on the girl's dress!) in just the right places!
And oh lord don't get me started on the facial expressions! The character's look very lively and that's due to their natural-looking facial expressions! I still have trouble when it comes to making a facial expression look natural but damn did you nail it!
The frame that you put around the characters just makes the whole thing even better! It gives it that good ol' vintage feel, you know? Hell, the characters themselves look like they're meant to be together (be it family, friendship, or romantic relationship. No idea who these characters are exactly so I'm just assuming things oops)!
Overall, this is a really good piece of art! good job