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That 'main' tree in the middle-ground was very well composed ( it frames the two characters at the mid-bottom and the leaves to the left side ), as it balances the composition out in its entirety. Your use of yellows and oranges here works very well with the more dull browns, adding a kind of 'life' to the piece. Also, with the dog running around playing with the leaves, I felt I could 'see' the scene play out in my mind, which I greatly appreciated.
With that said, I'll say that the 'dark brown streak' right to the left your signature ( it forms a diagonal line with the other two dogs and the two characters ) distracted me greatly. I can understand that you used it to provide dynamic eye movement by having it point to those characters and dogs, but I just couldn't make out what it actually was.
Overall, nice work man