Under View on the Scene tab:
- Skeleton draws the bones over the model.
- Wireframe draws every triangle edge.
- Normals draws the direction each vertex faces, which shows up shading problems in an edited mesh.
- UV layout shows each texture flat with the model's UV map drawn over it, one texture part at a time; the arrows switch parts. This is what to paint against.
Some creatures are vertex-animated and have no skeleton. The Skeleton switch says so for them.
All of them follow the animation, so a frame you have paused on shows the bones and triangles of that frame.
Debug views are never drawn into a screenshot made from the Capture tab.