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I like version 2 with grey and green, it's modern and trendy, this is the best of the 3 in my opinion. The big footer is also very nice.
I would have let more space to the main picture in order to make feel an emotion to the user when he reaches the website.
It's about giving a hope to a children, and in version 3 they are already smiling, so users could think ok somone already helped them.
