@KimSu12646 I didn't set a specific number of polygons that I had to reach. That's because I was simply trying to make the object look the way I wanted it to with as little topology as possible. To achieve this, I used about 410.8 triangles.
@BHarun82146 You can fix this by going to the Weight Paint tab, setting the weight to zero (which changes the color to blue), and painting over those red areas on the body."