Light on house & balloons is from upper right. Shadow should be cast accordingly. Otherwise this looks good.

Better, but the shadow is smaller than the house...and don't you think the balloons would have shadows too?

Much better. Good luck, author!

Author when I'm having trouble with how to do a shadow I Google image search for pics which might have examples of real shadows in a similar scenario/landscape/light setting, in this case maybe a tree with a large canopy, something like this perhaps
http://www.australiangeographic.com.au/assets/images/article/journal/8833/wattle-tree.jpg

The little girl is a neat touch ! shadows are hard to get right
well done : )

well put together

Congrats!