Nice model, but you should work on your rigging.
Try lessening your deform radii with your bones, as some of them affect other body parts.
Since your model (arms, legs, whatnots) are in separate parts, I'd recommend manually painting out weightings on body parts that shouldn't be moving. (ie. Your arm stretches the body left/right-wards when the arms swing forwards/back)
Nice model, but you should work on your rigging. Try lessening your deform radii with your bones, as some of them affect other body parts.
Since your model (arms, legs, whatnots) are in separate parts, I'd recommend manually painting out weightings on body parts that shouldn't be moving. (ie. Your arm stretches the body left/right-wards when the arms swing forwards/back)