I disagree with srsn that you remove the cyan line, I think the girl is running on water... I think its a nice effect,
though it glows too much, just decrease its glow a little so it would be a nice clean one...
for the butterflies, they seem quite odd for their sizes, they look too big and does not fit with the distance of the
girl from the wall itself... since the girl is far, the butterflies should be smaller to indicate distance, unless the
girl is more far than the butterflies.... I suggest you replace it with birds instead, but butterflies are nice
too
add a few more clouda in the sky, or maybe you can add an airplane (with smoke) just for touch... or maybe you can doo
clouds that are in shape of her favorite things (though I think its going to ruin everything! XD.... )
since its quite scenic, go to srsn's advice of putting some mountains... if you want it to be a little modern, then
you can go for buildings/houses
the water is quite weird, there are circles (that indicates a drop of water) but they don't have a drop and it
would seem really weird... I suggest you remove them, unless you're going for a "rain about to start"
theme for a wall...
that's all I can say, hope I helped ^^