In the book series by S.D. Perry, the yautja females are mentioned to be much larger than the males. Like 9 feet or so. A female next to a male would look like the reverse of humans, with the female being maybe 6 inches to over a foot taller.
Of course, since this is all fiction anyway - the females can look however anyone wants them too!
EDIT: And while we are on the topic, the yautja females probably shouldn't have breasts either since none of the species has lips to suck (maybe the babies have some kind of way around this?) and futhermore humans are the only mammals to have visible (enlarged) breasts when not breastfeeding - so it is very unlikely that a reptilian alien species would have developed them and then developed to have them enlarged at all times as well.
Like I said, it's all fiction.