I'd ask for an explanation for each of them but I think it would just make me more confused. =P
Quite frankly I was just doing a few pencil-and-paper sketches when I drew the Discord and Jackle pictures. My friend introduced me to a program called "Paint.net" which enabled some layered drawing and easier line layout. I took a picture of my sketches, put it in the program, and colored over them.
Concerning the third one; it's a story written by a guy that's incredibly gory and disgusting. I loved it, so I just made some fanart, thinking the author would get a kick out of it (he did).
-Chillz