I prefer the color version of #1 because the girl is without a doubt the main subject. The toned B&W leaves the issue in doubt because it has such poor contrast.
Same for #4. Both look like they were just de-saturated and toned, rather than converted to B&W first.
#3 has somewhat better contrast but the subjects face is underexposed because the bright background fooled the camera's light meter because it was in Evaluative mode. IMO, the photo would have been much better if flash had been used to control the background, and spot metering had been used.
It's to bad the watermark is so intrusive. I'd recommend you lose that huge P3 thing. It looks like it got put there as an after thought.
The color photo is the best, technically and IMO asthetically too. I rarely make outdoor portraits without flash or reflected light myself. Just a kiss of snooted OCF would have really made her pop.