Looking pretty good! So much so that it's hard to give any sort of critique. Maybe a few nitpicky suggestions...
Great use of color, and I love the detail of the sunlight going through the slits of the deck and hitting the water down below.
I think you could make the roof even more uneven (that sounded kinda odd...).
The lines of shingles, and the ridge in particular, could be a bit more wavy, perhaps?
You could also add some detail to the side of the house to make it less like a square block. Something coming out of the house, dunno exactly what... Window shutters, maybe...
Some more detail to the bottom of the vertical boards, where they meet the deck..?

I may have gone a bit overboard, no pun intended.
EDIT: Shifted the hue a little bit too:

The girl lying on the beach, It seems that we're seeing her too much from the top and the perspective makes me want it look like the camera is a little lower.

Hope that came through.
Composition-wise I have nothing to add.