Freaking awesome floffy, I am once again amazed by your photoshop skills.
However, if you want a bit of constructive criticism I'd say:
- The reflections in the water seem inconsistent as the things that are meant to be floating don't have reflections
- The leaves in the foreground on the right seem to have extremely low contrast/definition and therefore look unrealistic
- The fallen building in the centre seems to have an extremely low contrast and a strong gradient so it looks a bit unrealistic
- The floating objects in the water should be casting very faint waves to make it overall seem more real
- Building on the right has low contrast so it doesn't look very much like stone
- Big black gaping hole on building on the right in the middle ground would look better if it had a destroyed interior instead of left black
- Some other stuff that I'll mention if you ask