If I were you, I'd either make all of them color, none of them, or two of them color and two black and white alternating. But that's just me, and I have an OCD about patterns so whatever.

David kind of looks like a shrub with arms, Jon isn't recognizable as a human being, and I could only tell it was Richie because I recognized the picture from your avatar. You can have longer-than-wide images without stretching the subjects unrecognizably, and the picture's too small for whatever filter you put on David