you have some good work here and i can see you're experimenting, which is fab. The fiery, twisty, snail type piece is my favourite. Looks great!
I've gotta say this though, judging by the quality of the work you've posted in this gallery, it doesn't seem to me as if you made the following piece entirely in PDN, especially the water.
http://i1028.photobucket.com/albums/y348/PsychoHarmonic/th_boom.png
It looks to me as if you used a stock and photo manipulated it. You may think different, but many others and I think that it is ok to use stocks in your work. What is seen as 'wrong', is claiming that you created the stock from scratch. Thats my view anyway.
I'm just putting this out there, and I may be wrong, in fact, i hope i am, because the effect that was supposedly acheived is incredibly realistic.