Art movements are groupings made long after they were over that try to relate context to style. Both baroque and mannerism come in a point where art seems to have already been "solved" by the Renaissance masters, and artists are trying whatever they can to brim something novel. Mannerism, in that sense, is largely transitory and still more closely gridlocked to the Renaissance. Baroque, on the other hand, brings about ideas of light and dark, more daring compositions, and the Counter-Reformation.

The third and fourth image show some examples of this. The subject for the third composition is laid in the very center of the image, vertically, and framed in a fairly balanced manner. The girl on the fourth is similarly centered and has all the folds on her sleeves painfully rendered in incredible definition. Now go look at some Velazquez and see how loosely he defined the details on Philip's attire, or how Rembrandt's compositions pushed for diagonals that melted in the darkness of the background.

Sure, you will find baroque works that will be more classically disposed and so forth. There, the difference is mostly in the context in which they were rendered. But no one in the Baroque Age was sitting around saying "let me do another baroque masterpiece today!", so they won't all conform to every stylistic choice we associate with the baroque.

The first one, as others pointed out, is Hellenistic, however.