The first three are pretty recent.  The last one is from last year-ish.  As you can tell the first one wasn't even finished all the way. It is a drawing of Aya from Parasite Eve.  The second one is of Sailor Moon in an outfit I designed myself. The third one is Alyssa from Clock Tower 3 and I used copied the pose from a how to book.  The last one is no one in particular.