I would say they are "large", not medium sized, not huge either, just large.
what do you guys think? DD/E-ish?
I think the amount of projection she gets might skew her up a cup size larger than her overall breast mass would otherwise measure. so she might measure as an F cup or even G, with that projection... but the total breast mass looks around DD/E to me (assuming she's an average 5'5"/5'6" height).
I think her breasts are just about IDEAL for real life desires. I'd love breasts like hers.
(I differentiate between fantasy desires and real life desires)
my ideal real life size would be about as large as one can go, while still being able to dress them down for situations where you don't want to be seen as a pair of tits attached to a girl. Which is probably somewhere between DD and F cup.