- The pool water color does look ill; it should be more turquoise, healthier.
- Tiling of the floor on the left at the back is too strong, look for another texture... maybe something homogeneous.
- The hedges are looking too uniform.
- Your palm trees need something to grow in, they are just placed on top of the wood floor... think about notches!
- Palm tree leafs need to be reworked; look here and here.
- And maybe the most important point: Correct the perspective!
Your actual camera position does apply some kind of toy model impression to the whole scene. You sould lower it a lot at eye level.
Hope it helps!
You asked for it!

