That ones gonna be a bit diffrent, when you optimize you're really just letting the previous color shine through where it can. As you can see, no 2 pixels are the same in that picture, so optimizing really doesn't do much. What I'm going to do is just cut the monk from the middle, and paste that in front of a static background so it optimizes better, might not shrink it enough, but we'll see. I'll do that later.