I was just thinking about this question. Unfair to both ask people to recall the image and name them. So, reading left (I'll call horse 1) to right (horse 4), both your answers are wrong.
(edit...reading the other direction the answers would have been wrong as well! LOL! Thanks for playing).
The fourth horse would be famine. I think. And something about a pale horse comes to mind for the second half, so white?
Now then, not being like the CHEATER below, who can name the following without looking it up?
As I was taking in my Nostra "4 Horsemen" poster for framing yesterday, it hit me that only three of the four are represented as actual songs in Nostra. Which of the four is left out? If you can't name BY MEMORY which was left out, at least name the ones that are in there. For extra-credit, which horserider represents the traditional views of the 4 Horsemen?