I'd definately agree with the comments on the sand, it's too grey for tropical beach sand (where the primary component is coral, not rock) As well as the comment about the left island starting straight at grass, you might try the lava rock and take off the lava portion of the material and set it at the lower elevation. The sky definately needs to be less cloudy, probably closer to a sky blue than a true blue. Other than that it looks really good, I like the water in particular. Hope this helps!