First sig evaluation on PokeCommunity! Sorry if I'm being too harsh, but...
Vaporeon sig and Ho-oh sig don't comply to this. Try to make the render stand out from the sig, because that's what you want your readers to focus on. For Cresselia, maybe you can burn the render a bit, with the same as Absol. I don't really like the grey stuff on Arceus. If you put that grey brushing layer behind the render, that would solve it. For Zoroark, try duplicating the render a few times. As I said, you want to make the render stand out. I liked the Ho-oh sig without the stars. But maybe if you can add some C4Ds, the background won't be so plain.
The text for all of them was alright, but maybe if you lighten the Zoroark text, it would be better. I don't like the way you put a star on the Ho-oh text, but that's my opinion. And, you spelt Cresselia wrong :)
I can see you have got talent. If you improve a bit more, I can see that you would be a great sig maker, because you position everything in your sig perfectly. My tip for you is that look at other sigs and look at it carefully, and try to do it how they did it, except with a different render of course.