Very nice. You did well on the dress, and the clouds and grass look good, especially the grass. How did you do the grass, anyway? Interesting pose too.

The grass is just a couple of brushes that come with Photoshop. I just set two different colors of green for my fore and background and ran it beneath and around the characters (used a couple different sizes to give the illusion of the grass receding in the distance). Then, I made a layer above the characters and carefully ran the brush around their bodies to make it look like they're lying in the grass. The big blades on the bottom edges are just a larger version of the same brushes.

Oh wow, I just fell in love with the expressions on their face - really beautifully well done, you've really captured Sadie's pure emotion there. The pose and anatomy's also very well done. Also, Sadie's real real beautiful. =p

The grass was absolutely well done because the gradient can't really be discerned - it looks very realistic.