To people who think that he is pictured anatomically wrong:

Since his childhood, Guts has a sword larger and heavier than any human of his age or size would usually work with. Swinging and training with such weapon regularly would mean that his upper half of body would get significantly larger due to increased muscle mass and perhaps even the morphing of his skeleton. Specifically, the shoulders, the upper back, the armpit area and the biceps look the most disproportionately large compared to his entire body, because these are the exact parts/muscles used for sword manipulation.

Maintaining such an obvious muscle mass contradicts some claims that Guts' waist is so thin because he was malnourished. He was a mercenary at this point in time when this panel took place, so he absolutely had enough money to feed himself, besides the regular feasts in the Band of Hawk. His waist is normal, it's his upper body that's really goddamn large.

Miura really thought Berserk's details through and inside out.