Here for your requested critique.
You were close with promotions, and your animated banner nearly convinced me.

It's very well-done. Your signatures are another strength, with great use of negative space and simplicity. Same goes for the icons. The banners, however, are more all-over-the-place in terms of style, technique, and issues. The banners I think are best are
this (somehow, you make that text work, even though the quote isn't ideally placed),
this (although trendy in its use of stock, you made it look good), and the animated banner.
The ones to work on:
- with
this banner, the background stands out too much. Try some obscuring colour layers or textures to quiet it down a bit - I can't clearly enough see the foreground images and the text.
-
this banner is nice, but overexposed (too much whiteness).
- on
this banner, watch the hardcut on the girl's arm (still black showing), and the colouring of the photos doesn't match the rest of the graphic well-enough.
-
this and
this have an interesting style, but I think you need to do something more with the colouring to give them more depth and make them look polished. As is, they appear unfinished.
- similarly,
this signature needs more to it. It's just a cut image (not to mention oversharpened with contrast issues). Try using additives and other things to perk it up a bit.
- with
the blend, there are image quality problems on the girl, who is very pixellated (probably from oversharpening).
That's it! Especially watch out for image quality, which includes contrast, sharpening, blurring, etc.