I didn't play the demo but on your screenshots, the color mix is realy weird.
The clade of the palms look like they are lit by a yellow light, but the house reflects white light ^^ The Ocean is much too blue and the terrain grass texture much too green. All in all you mixed up too much "strength" colors. Try to adjust them more. Use FarCry/Crysis as reference and look how the colors are adjusted there.

It looks like you put a lot of work in this thing, so keep on working and *thumbs up* so far

Dark_Samurai