I don't know if it's just me, but the water looks really quite realistic (almost photo sort of quality with a
bit of a median) which is perhaps why this was deleted. (More specifically, this wallpaper doesn't really look all
that finished, actually, in terms of detail)
In general, the scan doesn't really blend in with the background- the lighting hasn't been considered
(it's so dark yet they are so illuminated). I'd suggest tinkering around with saturation levels and hues on
Photoshop (Image/Edit(?)> Adjustments> Hue/Saturation) The scans are simply very warm coloured, whilst the
background is extremely blue and cool- so we might need to balance these out ^_^ It'll also help blending
^_^
Downloading sets of fonts is a great idea and then installing them on your computer. The font seems a bit default at the
moment and there could be some other great font which might work a bit better- and as mentioned, a lighter colour will
work better.
Last but not least composition, they always say that the best compositions are in thirds- I think the horizon is a bit
too high up and can be moved down a bit so the top third is sky. Or alternatively, the bottom third is water and top two
thirds can be sky.
And don't forget water reflections ! ;) These can be done with another layer of water on top with dodged bits with
highlights (and then set that layer to another blending mode), or with brushes- a simple X shaped brush you can find in
the default brushes can work well.
Hope that was of some help! ^^