I think these look noisy for a D3300. There are a few things going on that are just a bit tricky, and the first is the dark eyes with the big, black pupils. The first thing I would do is to use the iris enhance brush in Lightroom, at a moderate strength, and brighten up the eyes to match the skin. The skin is fairly bright in these, but the eyes show a dark room.
The second issue I see is the way the skin is rendered, in that we can see some yellowish undertones, as well as some pinkish tones, and also some under-eye magenta tones. This is something I've noticed on young children, and I think it has to do with their relatively thin, delicate skin. It seems to me that electronic flash light, from closer distances or when shot directly, can actually penetrate into the skin, and reveal color differences in areas that are close to one another on the face and nose. Whatever is the issue, I think the hair and skin have too much of a yellow tinge to them.
Something makes me think these were shot as in-camera JPEG files. There's just something to the color that looks like Nikon's JPEG engine rendering. I took a crack at these in Lightroom and did a bit of Yellow and Orange HSL (highlight, saturation,lumninance) correcting, but I'm not really satisfied that these are as good as they ought to be in terms of skin tone color.
I burned that magenta background issue down in shot #2 at the top and on the left side with the burn tool. I think there might have been a white balance mismatch with the light source at the time these were shot, which has lead to less than optimal color rendering. I did a bit of iris enhance on both these, and brightened the look up a little bit in both and tried to cancel out some of the yellow undertone in the hair. Shot #2 is still a bit overly contrasty,and was to begin with, with the hair ma bit plugged up in the shadows.