Hmmm.... nice. The first thing which i love about this wall is the camera angle. That really sets the whole wall into the absolute correct perspective to what it is. The realism as you have mentioned, has been maintained very nicely. I think that the bg is perfect for this scene and this angle especially. Although in some ways, the original scan does look a bit better. But it's alright even if there are no clouds or anything in the bg. We can have a clear sky, you know :P

The vector is also very nicely done. Very clean. The seagulls are very important here. They suggest the having of a beach nearby. Which becomes necessary when there is nothing else to do the same. So, i think that the wall is complete. And nothing necessary or important is needed here to add to the bg or anything.

There is however, always room for improvement and even here. You could have added a few rather 'trivial' things. Like, maybe the glare that we see in the scan of the sun. Adding the sun the same ways, that is. Or some water droplets on the camera to give a more realistic effect. OR, just wet the hot body of that girl to sizzle things up like The Firestorm! ;D

Lol... what i mean to say is that making the lower torso(Mmmm... hmm... lower torso.... interesting... xD) a bit wet as she is already in the water. But just a bit. It would also add in a bit to the 'ecchiness' of the wall. (*Imagines it* Results of imagination = *DRooOLLLLLZZZZZ* O_O O_O O_O)

But these are just some 'extra effects' sort of stuff. It's not necessary but the wall could've looked better with it.
The wall is perfect as it is. And i like it! :D
Nice work, Brad! ^_^

Warmest regards,
The eiji7983