in 1 the light and background are working really well, i also like her expression. the back of her head is cut off, always unfortunate.
2, the light is flat, the left arm partly in the frame doesn't work composition wise.
3 is an excellent subject but framed too tight on the left. the background here is dull and there's no context.
in 4 the tilt does not work as it seldom does unless the picture is of an abstract nature and then still it should be used with care.