You have a really beautiful style, and I love your choices of colors here too. The composition is also really quite nice. There aren't very many things I would change about the piece aside from the girl on top's breasts are very lopsided and that is a little distracting from the piece. Especially since the breast closest to the viewer seems quite a bit larger than the other one. I also agree about the girl on bottom's pinky being a bit too short for her hand. Keep in mind that the length of a pinky will always reach the bottom of the top knuckle on the index finger. The only other thing that feels off to me are the snow/fire embers. The style of them feels for me like it's clashing from the rest of the piece and distracts from the overall good work you did on the girls. I don't really have any suggestions on how to fix that, though. For the most part you've done a great job. Just keep refining your style and keeping an eye out for the occasional anatomy error and you'll be good to go.
The pinky on the girl in the orange is a little too short compared to her palm, and the breasts could be just a hair lower to keep in line with typical anatomy standards. Something about the swirling snow/embers seems like it was from a completely different style, and might be better replaced by either adding in a flat graphic background interweaving within the characters, or reducing the transparency of those items to focus on the characters more. That all being said, I really dig this piece and am blown away by how you got the fabric folds to look natural. Excellent shading work, too.