First : I love your vision of characters and the situation (dont ever know originals characters) and it's improving impact on the public ^^. Good point and good choice.
The physic and technique are really good, there are some little mystakes or defaults, but in globality that's a good part, and you cover the sheet verry well ^^. I particuraly love your trees and hairs. You copes very well with anatomy and positions, but care with the perspective between the little girl and the man. We can believe than his leg and the child are in the same plan with his head or his second leg, and his book isn't really clear too. Where is the book ? On his left leg or in front of his bust ? We dont really know because of the hand holding the book doesn't overlap the left leg or other part of the picture.
Another point is the shadows. You can enhance its a bit to creat a more visible contrast between the luminous background and the gloomy foreground. I think if you add some shadows on the man and the closer girl (who's sleeping) you can improve a little bit the volume in your picture.
By the way, well done for the trees, the fire and nature overall. Love the grass o3o !