There's that darn holiday spirit XD. This family-photo-like picture is drawn well.
Perhaps some of the body anatomy and the perspective on the faces could be altered a little,
such as the kid the the right who has a bit of a big head (or maybe it's that the eyes are the same size?).
There could also be shading, in addition to the highlights you gave, above their eyes. Eyes are like spheres;
they have both dark and light spots.
Happy holidays!