She fixes a cuff once and leaves it alone. The strap sits a little off where it landed. She does not glance around to see who noticed, which is the part men tend to notice first.
The lipstick might be darker than the room calls for. The blouse might be open one button past polite. Still, there is no little panic-check in the mirror, no quick tug when someone walks in. She pauses before looking back, late enough to make the other person wait.
It reads less like posing and more like she had already decided she looked good before anyone arrived.