Great job BD...

As Peto says, its great to see you improve the way you have done since you joined. Its also great to see you experimenting with all this stuff. Even the images that end up in the rubbish rather than being shown here are still worthwhile exercises (I've certainly made plenty of those as I'm sure we all have). You should be very happy with yourself and these shots.
My pick of a favourite is #1. The lighting is lovely and soft, you've given it a unique style which suits the image, and you've done a good job with the vignetting. Of course the model and her expression are also lovely.
My only issue with this shot are the whites of her eyes and her teeth... they look a little grey rather than white. They don't need to actually be
white, but perhaps they should be a touch lighter
relative to the tone of her skin to give the effect of being white (ie you could either brighten the whites or else darken the skin a bit).
I can see where you're going with #2... and while I think the idea behind it is perhaps a little bit cliche for my liking (sorry), I think it makes an
excellent exercise to improve your skills. You've also done an great job in putting it together as a composite image.

As for the vignette in #2... well I think in general its a lot tougher to make a white vignette look good than a black one, and white doesn't really work against a dark background as you've used it here. If you're after a "dreamy" effect and want to keep the black background, then have you considered using some kind of blur effect towards the edges of the image rather than (or in conjunction with) a vignette.
Also, rather than using a particular colour to create your vignettes, another idea is to create a new Curve Layer (and darken or lighten the curve substantially to give you the maximum vignetting levels) and then use the Layer Mask to create the shape of the vignette. Not only does this give you a lot of control over the shape (I usually hand-paint my vignette mask and apply a gaussian blur to smooth it out), but using a curve rather than a flat colour gives you a lot more flexibility over how the vignette works. For example, you can maintain highlights in the vignette and just darken mid-tones and shadows, or you might use the vignette to increase or decrease contrast rather than brighten or darken. Just a thought...

I probably didn't explain that very well, but
here is a link to a small (860kb) photoshop PSD file with a vignette layer that illustrates this technique.
Cheers
Adrian