Hi Orlan,
Some nice fun shots you have there. You've dropped down to level of the children, which is good. They look very natural too, which to me is the best thing. You capture the true spirit of childhood that way.
Only thing I would have attempted differently, would have been to use fill flash on the last shot, just to lift the shadows off the little girl's face and clothing, as she is back lit. I know, bright sunny day, why the hell would you take your flash gun, right?? Generally this gives you the nicest lighting, particularly at sunrise and sunset. Back light your subject, then use either a reflector or fill flash to get perfect exposure throughout the scene.
I know from personal experience that photographing kids is never easy though. Either they don't co-operate on command, or are totally unpredictable when attempting candid shots, so I think you've done pretty well here. I really like the bright, vibrant colours of the metal flowers in the background and I think it works well with the blue of the sky. I do find the concrete thing on the left a bit distracting though and would be tempted to crop that out. I did that in the quick edit below and the little girl falls directly on the left 3rd of the composition. I also rotated the photo a fraction, just to make the metal flowers vertical. See what you think?
