Blue exhibits strangeness in portraiture

The color blue in portraiture, despite the art style, exhibits strangeness or eccentricity. (Writing in comments to art, will be done by 12am.)

Although this man is posed nicely, the dark blues press upon the mystique of his missing face.
I get the impression that Gerstl wanted to create a physical depiction of how he feels on the inside. I feel the blues in this portrait really convey the strangeness that he feels.
The dark blues of this piece amplify the oddness of his posture.
In this piece the light blues add a feminine touch, and adds contrast to the dark blue of strangeness seeping up from the bottom.
The blue of this piece amplifies the strangeness and supplements a whimsical tone.
The shadowed effect of this woman's face, with the bright blue background adds mystique but accentuates the pride and weirdness that she exhibits.
In this portrait, the blue adds to a sense of paranormal activity, as she has almost portrayed a sense of her spirit leaving her body.
Using a lighter blue adds a calming feel to this girls portrait but the blue -grays of the background add a sense of strangeness.
The blue is used to amplify the focal point of this painting, but I believe it as also used to supplement and add to the seriousness, and maybe even lonliness that he feels.
The blues in this piece add to the whimsical nature and mystique of this painting.
Aside from the fact that van Gogh enjoyed matching yellows and blues together, I believe because he used so much blue in this self portrait, he wanted to convey the sadness that he feels.
In this piece, the blue adds to the strangeness and awkwardness of this woman's posture.
The blue adds a sinister feeling to this painting.
The viewer is able to infer by the blue that it is nightfall on a beach, but it also brings forth this sense of lonliness and strangeness.
The blue plays a different part in this piece, where the blue is adding balance by lifting the mood.