Hi there.
Well since we're doing that I'll give it a go as well!!
First of all let me tell that you have all the information necessary to do some adjustments to make it look absolutely fabulous. If I can bring up detail in those low res pics than you can do it on your high res pics.
Let me explain my approach. Basically what I do is I'm "relighting" things I think need exposure and things that need to be brought down a notch.
In the boy picture I brought up the eyes a lot since they were the least exposed part of the picture and at the same time I blew up some parts of the skin. To bring more attention to the main subject I darkened the background and also part of the shirt.
To finish things up I moved the whole image in the blue spectrum since the major colour in the composition is blue.
I followed the same procedure for the girls. The girl on the left was least exposed compared to the other girl so I over exposed the left side of her while keeping the right part on the dark. I also brought up some details of the eyes on the girl on the right while I darkened part of the neck to define the shape of the face a little better and to also play with the light a little bit more.
I also reversed the lighting on the background. More light on the left where the girl is least exposed and less light on the right where the subject is more exposed. I also pushed the whole image on the yellow side. And finished of with a bit more contrast.
Since you probably shoot RAW don't stress yourself too much with the super great lighting. Especially if you're on the go or shooting a candid moment. If you're shooting RAW chances are you can fix it easily in post.
These adjustments took me no more than 10-15 minutes.
And try to approach your corrections in a way that compliments the image. Don't make massive colour adjustments. Fix things locally and then the whole image will start to build up.
Hope I helped even a tiny bit!!