Your armature 3D model looks weird typically due to incorrect weight painting, flawed bone structure, or rigging constraint issues.
Weight painting mistakes make meshes deform unnaturally when posed. Poor bone placement or alignment breaks natural movement. Faulty constraints (like IK) cause unintended twists or stretches.
Try previewing bone influences in weight paint mode or adjusting bones to match your mesh’s anatomy—small tweaks in your 3D software often fix it.