Some quick observations - not beating up on you pal, though it may feel like it:
Nothing seems randomly rotated or randomly sized. Bushes and little trees look like identical copies. The big trees behind are dupes too. Your leaves give that away real fast. Rotating 30-some degrees here and 80-some degrees there makes a HUGE difference.
If we are shooting for
reality, I have never seen a pool like that. Is this an above-ground pool?.. A really, really shallow one? And it would never pass pool code here in the states -- you need walkways completely around pool, so folks can escape water. Speaking of water, I can't see
into it at all... But I guess that is result of DL.
The architecture overall is rather strange to me. I'm not sure if that is a door or windows with the arch.. It just looks wrong regardless. Especially right under the arch.
Your railings look somewhat short. No railings, especially on 2nd floor could ever be any shorter than 36" high. Ever.
Your window and door trim are from a parallel universe. No one (that I have seen) builds trim that deep/thick - or every bird and his brother would build nests all over this mofo, and bird shit would be everywhere.
This big palm on the left appears to not be self-shadowed at all on the trunk.. 'sup with that? Are you shining an invisible light up there?
Last but not least, the roof, or lack thereof, is pretty funky as well. Even a totally flat roof home or building is going to have some more thickness up there. It's as if you put crown molding at the top of your building, and called it a day...
That is it for now. I hope you are open to criticism. All of this stuff is easily fixable.

The moral is: Always use reference images. Google Images is your best friend when doing architectural renders. Never work from memory.