Yes, actually a slim waist in the number #1 priority for a beautiful body.
Breasts and butt are #2 in my opinion.
You can have huge boobs, but if the waist is quite thick, the body will not look as hot and healthy that if waist would be small and toned.
I know it very well since I myself do have a round butt and small but nice round breasts, but most of my body fat located in my belly, like really thick, due to diet mistakes a year ago. And this absolutely changes the body shape. Even if you have the sweetest breasts and/or butt, a minimum of belly slimness proportionally to your curves is critical in appearance. Just Belly size can make you look either more overweight than you really are, either childish, or just look like a sexy woman (when it fits with the curves).
There is a hip-waist ratio on the net to determine if you're concerned.
But don't worry, a truly healthy body always get a small waist long term.
And by the way, gorgeous body on the pics.