Too dark since the tree house should be your subject, but the ocean and sky are the major focal points...

Nice house, the tree looks like its just stuck under it rather than supporting it though. Not sure how your program works but i'd suggest you increase the size of the tree substantially, chop off the top of it then sit the house on there and get rid of the base with the staircases.

Cool picture, nice render.

wow fantastic scene...but first of all author,tell me,where is this place, because i would like to go there on my next vacation...

Its in the exact spot where the Atlantis was some million years back