Image by image, I'll give my opinions.

1: Not recommended. If you're going for a femme fatale, I suppose this works. I'd recommend a picture of what the character would look like "most of the time" for convenience.

2: Recommended. Looks like an identification photo. It doesn't show her physique much if at all, but it could work.

3: Not recommended. Extremely sketchy and unrefined. I wouldn't recommend it for any character.

4: Not recommended. That's going to be annoying to look at for reference due to the slant. Also, it doesn't really fit the environment of Fallout.

5: Recommended. This seems to fit the setting really well. It looks a bit sketchy, but I would recommend it as a reference for convenience sake.

6: Not recommended. Fairly basic, but refined and easy to look at. The angle isn't the best(as in, it's pointed at the side of her head), but I guess it's alright if you really want to use this picture.

7: Recommended. I would recommend the use of this picture, albeit only because it fixes what #6 gets wrong. It's anime, so what remaining concerns I have relate to that fact.