Common mistakes when skinning armature 3D models include incorrect vertex weight distribution, skipping early deformation tests, misaligning edge loops, overlapping bone influences, and misusing weight painting tools.
Incorrect weights (e.g., a vertex tied too much to one bone) cause stretching or bulging; skipping tests means catching pinching or tearing too late. Edge loops that don’t follow limb flow lead to unnatural bends, while overlapping influences make poses unpredictable. Misusing tools (like ignoring symmetry or falloffs) creates uneven results.
If you’re new, test simple poses (bends, twists) after each weight paint pass—this fixes small issues early without redoing full rigs.