Why is my weight painting 3D model ugly?

Your 3D model’s weight painting looks ugly usually because of uneven vertex weight distribution, leading to unnatural deformations when animated. Sharp weight transitions (instead of smooth gradients) or weights on the wrong bones cause bulging, collapsing, or jagged movement—like an arm vertex 100% weighted to the shoulder but 0% to the elbow, creating a harsh split when bent. To fix it, use a soft brush for gradual blending and preview deformations in real-time to catch uneven areas early.