Nice heroic proportions bohater13!
My personal take is:
Pick #1 if you want to focus on the femininity of the character, #2 if you want a nice all around pose like those you see in an rpg book or for a female knight because it implies stability, #3 if you want a more masculine heroine (maybe a barbarian) and #4 if you want a pose that implies combat is imminent. Also keep in mind for #4 that great swords are heavy for 1 hand (not extremely heavy but the strain drains the arm quickly) so that's either good if you want anime physics or you can make the sword lighter for a duelist type of character (either choice is good as long as that is what you want).
Personally I would go either for #1 like aehabtawfeeq said or #2 (I have a soft spot for knights^^).