This is kin to my recent thread on "style personality", I think...and my own sense is that no particular system on its own can be prescriptive.
My own experience is like yours. In fact, I'm even lower contrast than you, or at least, now that my hair is grey, more "neutral" -- light hair, light skin, mid-dark blue eyes. Yet light low contrast outfits typically drain me of life and energy, unless they have enough brightness (i.e. my recent whiteout outfits.)
I think what slim cat says is correct -- if you are at all gamine, you need a bit of quirk or drama, regardless of your personal colouring. That can come in the form of contrast...or via pattern or line or the cut of garments.
The colours in the first outfit are pretty on you, but you don't seem quite yourself in them. It could be that they are veering a bit warm, perhaps. But I think it's less about their warmth and less about the contrast level than the saturation level. These are very light (pastel) tones as well as being low contrast. If you are a soft summer, you are probably more flattered by mid tones.
Then, too, the floral pattern is very pretty but it might veer slightly feminine for you in combination with the lighter tones. But if you had a skirt or pants in the darker note of the floral pattern, you might feel entirely different in the outfit.