This was always the difficulty with a TP HD remaster - the bar was so low to begin with on graphics that it was always going to be tough to get it to modern standards. Wind Waker HD looks so much better because the original Wind Waker looks so much better. For TP they'd probably have to build it from the ground up (which for a full priced game, they could have done, but that would've defeated the point of making this game - to act as a quick stop-gap before Zelda U)