Surrealism is a good approach for this theme. I'm not sure what tale the fish is telling, however. IMO eliminating the distracting wallpaper so the windows and baseboard are just suspended in space would be more surrealistic and would give a lot more attention to your dramatic background photo (which has erroneous lightning reflections in the water but those should not be visible here). I think the fish that is supposed to be the focus would then stand out a lot more. Even if the window pair were centered, I would consider deleting the right one and moving the left one so it's centered on the Rule of Thirds' left vertical line. The table and chair have different perspectives than the floor. The scale of the chair is odd given that it's in front (not way behind) the table. Nothing seems to be casting shadows. [Surrealistic does not mean totally unrealistic.]

I agree with DanLundberg on the wallpaper. The color/pattern of the wallpaper is taking the focus away from the fish. Its completely up to you if you wanna keep it as it is.

This is much better IMO. I like how the cool green/blue/neutral palette of all the background elements makes the warm orange/yellow fish stand out more. I also think the title revision with the new exterior view that's under water creates a more coherent story (or tale, if you will ).