Hi Daniel, and welcome to the Critique Gallery.
What you ask for is what we do, but its not an overnight proposition. Upload regularly, take in the advice we provide, use it, incorporate it in future uploads and we can help along the way.
So two things to start. One, go to my home page (click my name) and read the blog. Its the combined wisdom of the Critique Team and has a lot of useful tips, - worth a read and as good as a beginners book on photography.
Next, a critique on this shot. I will leave out the colour popping (leaving the t-shirt pink) for a moment.
I like the angle, the expression, the pose. All very nice.
The purpose of an image of a child is to get a picture of the face. His face is underexposed, - too dark. Why its too dark is a guess, - it looks like there might be some bright light behind, or coming in from the top, and that will cause the camera to underexpose, as it influences its metering. In a case like this, manually pop up your flash, - it will provide enought fill light to brighten the subject. We will leave the non auto or non P modes for another time.
If the image is well exposed, thats the first step. Then you can decide if you want to colour pop or not. In this case, I wouldnt, as pink is a weak colour to pop. A straight mono will look good.
Now look at the image, and look all around. Easy to do here, but its also something you need to do when taking the shot, - look all around the frame, look for lamp-posts sticking out of heads, and big heavy locks with keys in them at the side of the frame, - like here. The locks are an immediate draw for the eye, - whereas you want the eye to be drawn to the subject. Try tp re compose, move, zoom in, or out, whatever you need to do to exclude distractions.
So as an example, I have uploaded a modification of this image. Scroll up, clck the modifications tab, and view the mod LARGE. Ive done all that Ive suggested, and added a closer crop; sharpened the boy; blurred the background; and the frame is added just to make up the 1000 pixels. What you need to think about is that YOU took this shot. And this is its potential. So you are off to a good start.
Hope this is helpful, and enjoy the site.