I never analyzed prints really until this year, either, except very broadly with respect to scale (ditsy teensy florals vs. great big bold prints) or colour (did I like it or not). But I think if we're going to wear prints and we feel "print averse" it can help to know what might work best on us.
I am not Vildy so could be wildly out of line, but I suspect by "white space" she simply meant that you have a high forehead and fairly wide cheekbones (based on the pics) - and combine with the fact that your features are fine, this means that your features seem spaced out in a way. Some people's look smushed together by comparison.
Shannon's features are also quite fine, BTW. But her face is narrow as well and she wears specs that take up space.
Here is something else to consider: Shannon's haircut is sharp and angular. This, along with her slight cat's eye specs, might provide a bit of "edge" that provides a pleasant contrast to the soft, almost "blurred" floral of this jacket.
Ceit has an angular jaw and glasses as well as straight (ish) hair. These provide a similar contrast.
In your case, your features contrast a similar way --- but your hair is very soft and wavy and a bit "blurred" like the print.
IMO this does not look bad at all. Some might prefer the effect. There's no "right" or "wrong" here. But it might account for your feeling that "This looks different on them than on me!!"
This is all incredibly detailed thinking by the way - the kind of thing I never remember to consider when I'm about to make a purchase because I love the way something looks on another Fabber! Hmm. Maybe I should do it more often.