Whenever a model looks good there's always someone who cries "Photoshop, Photoshop!"
I don't it performs miracles, they'd still look good without airbrushing/image editing/etc.
As far as biggest
Rachel Aldana,
Leanne Crow, and
September Carrino maintain a lovely figure with such large breasts. Trust me, it's hard to deal with breasts like those sometimes, and mine aren't as big!