Teach me something - C&C please

That's a good picture of your child, showing her while she plays in the sand.  For C&C, I hope I can help.  This is the best way that I can explain it.  Remember first that everything in the photo is important (not just the subject matter).

So by understanding that, you could have moved around slightly to have had a better background.  Sometimes it only takes a few inches...think about that next time you are looking through the viewfinder or the LCD.  I would have had her more towards the center, (but still offset to the left).  There's much too much empty space on the right.  The upper left part of the background is distracting.  I don't like cropping off the top of the head, although some people take closeup portraits of people that way.  I would have shown more of the surroundings...basically backed off a little so the fingers aren't so close to the bottom.

The good part of the photo is your child, so by thinking of the other things in the photo...that could improve it a lot.  Plus I would have waited until she had shown more of her face in better lighting.  It's similar to whether I'm taking pictures of birds or people...waiting for the precise moment when they turn the head a certain way.  A lot of this is subjective, as each person likes different things different ways.  So, experiment some...a most importantly create a picture in the way that best looks good to you.