hi
There is no contenuity to it all the images have diferant levels of opacity to them and just randomly placed in the sky.
Also the way the main 2 charicters have been cut out at the hips and just left strait it gives the hole image the effect of 2 halfs instead of a flowing work of art alot of that is due to placement of the text in the same place as the cutout.
I think the levels of opacity are due to the cutouts did you do the opacity so it made the cutouts look good ??? if so you are far more better to spend the extra time to cut out better and blend rather than a quick fix you will be much more happier with the result.

i find a little bit of outer and inner glow helps with blending but dont do to much and it would work well with that image
i hope this helps coz you have talent and the image is good