Aight im gonna comment on number #4 wich i think is your best out of these :)
I realy like your flow in that one but i got a few tips for ya:
The tag looks realy flat now becouse of s serval things,
u need more darker area's in the signature. And u need more contrast in your smudge.
U add darker area's with the brush tool grab a 100/200px soft brush and brush the places where u want it to be darker. than set the opacity to around 20-40%
U get contrast in your smudge when making more smudge layers and by adding the adjustment layers like:
Curves-Brightness/contrast-exposure.
Its also lacking some color. adding some photo filter's and gardienst can help.
I think smudge is a strong part of your skils so i recommend u following my own tut :D
Its one of my first tut but it tells you how to get color and contrast in your smudging: http://www.gfxvoid.com/forums/showthread.php?t=71994
If you have any other questions dont bother to PM me as i can see that your dutch, and i am to so :)
Nice stuff mate, but the major issues you have are your quality, blending and composition.
What I mean by quality is the quality of your effects, focal, background, etc. I'm noticing in a few of your pieces your focal is really LQ and that's only because of how it originally was or how you edited it. I would advise you pick proper renders and stocks and erase effects off the focal point as much you can because you want it to stand out.
As for composition, it's ties in with the quality as you sometimes overuse effects. You have a nice way of organizing your effects but you add too many and therefore some of your pieces are messy.
Less is more, my friend :).
A third thing that I'd just like to throw in is your blending. I believe you're try a bit too hard to blend your things, I'd try to use the burn/dodge tool and adjustments more to help you with that.
