In AmE, photos one and three could be called "sweaters" or, more specifically, "pullovers." The pink, grey and black diamond-patterned shirt seems to have a fleece lining and appears to be a sweatshirt, not a sweater. However, it could still be described as a "pullover"; the word "pullover" is used to differentiate between shirt styles that are buttoned or zippered up the front and isn't limited to sweaters.
And, Rique, sorry to contradict you but I don't think that by definition a sweater is a garment that is worn over another garment. Turtleneck sweaters, for example, are worn as solo garments, as are pullovers sometimes. Traditionally a sweater is a garment made of knitted, crocheted or woven yarn.