It's really just the hair... That's definitely Makoto's hair style, right down the the twin ahoge. Plus the clothes seem like her style. But yeah, her face looks... much more manly than usual. It was probably just to show that she's moar manly than Ryo, but they really didn't have to worry about out-doing him anyway...
Yeah, it looks kinda weird, but... heroic manly Makoto is always a good thing.