The first signature has the ocean riple in too much optacity. Try dublicating your render and then smudging a bit so you can make a nice looking bg, which will blend with the render.
The second one has a filter ( I think it is ocean riple again ) which is overshapened. Also try lowering its optacity..
I like the clouds you used btw..
For a starter i say you are cool.
Because my first sigs sucked ass