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I personally find the eyes strange... With real eyes, the pupil is in the center and the colour is on the outside. According to Wikipedia, the pupil is apparently not actually black, but a transparent hole that allows light to enter the eyes... People have different styles, of course, but I dunno... I think a dark outline would be alright, but I think that black outter circle is a bit much. I think it's fine with the pink-haired girl; sorta reminds me of how Kirby's eyes are.

The pink-haired girl's forearm sorta seems like it's getting bigger as it gets closer to the arm... With loose sleeves like that, I dunno if it makes sense for them to be like that on that angle... Like, her hand isn't spread from the sleeve's end to the other end, so I assume it would slide down some. Also, her elbow on that arm seems off... I'm not so great at bent elbows, myself, so I don't really know what to say about it other than that it almost seems like there's an extra joint in there.
The silver-haired kid's arms seem to be a lot longer than everyone else's arms. And s/he seems to be in front of the green-eyed kid, but his/her hair is behind him, which is sorta weird...
I'm not sure where the green-eyed kid's left arm went...? His right shoulder seems kinda stiff and/or maybe bumping out too far compared to the others.

The girl holding the photo... Given the perspective, I think her left leg needs to appear longer. Unless it was bent, but then I don't think the angle would make sense. Also, the dress (the skirt part) looks like it isn't going around her body, but just hanging in front... I'd either make a wavy line sort of connecting the dress' two ends or make like, another visible fold behind the the side to our right, and that would maybe start around from the waist until your finger's width from the bottom of the dress... I hope that sorta made sense.
Also, her head doesn't entirely connect. On the right side of her face... I'd maybe just add a little more hair there to cover the the missing bit of her head's outline. Her eye sizes are maybe a little bit too different, I dunno.

Anyhow, I think the rest of the picture looks very nice overall. The hair, the heads, the faces (aside from the eyes), the folds, the colouring... I like it. It's a cute style.