Dear Olena,
The biggest issue I think you will face is that there is no direction to the light source, and as Mike mentioned virtually no information with which to model values The second issue I think is the wide toothed grin which causes the child's eyes to almost close.
That being said, there is a great deal of artwork on your site that is quite loose and slightly impressionistic, and if that is the style that has drawn your client to you, you'll be in terrific shape.
I agree that the composition of image 3 is pretty close to perfect,including the grayed down figures at the right - they can act as a very nice visual "stop" - you might even reverse the direction of the rightmost figure to reinforce its compositional strength..
Ilaria's link is very helpful as well
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