Dear Friends and Visitors,
There are still a couple of issues concerning Vermeers' production that I would like to address before closing this topic. One is the delicate matter of authorship. In effect, despite discrepancies from solitary voices, and using feeble or wrong criteria or simply responding to vested interests, countless dubious works have been attributed to this or that great master by "experts" without other proof that the weigh of their authority.
Without insisting too much on this, I will point at a painting that clearly suggests that I may not be wrong in my personal appreciations. Significantly, it is the painting placed the last in the complete catalog - not to mention the fact that it is the number 37 in it. You may accept or reject this, but I think Vermeer would have never painted a 37th, and obviously inferior, work once he had accomplished a corpus of 36 master pieces, 36 being a
round number, a number of completion - and I am sure he would had paid at least some degree of attention to such detail.
However, there is yet another reason besides this somewhat esoteric consideration for my not accepting the present painting as authentic. It is this: unlike all other paintings accepted as Vermeer's work, I cannot say this one is a master work. And this alone should be enough evidence that it is not his work (or at least not completely, since it might perfectly have been painted totally or in part by some student).
(click on image to enlarge)
Jan Vermeer (?) -
A Young Woman Seated at the Virginal (c. 1670)
Other considerations include the folds of the girl's shawl, unworthy of Vermeer's superb skill in the chiaroscuro technique, and the girl's somewhat clumsily painted arms and hands.
However, the main consideration for regarding Vermeer's authorship of this painting as highly dubious is perhaps the girl's face, "slightly below par," in the description of the catalog, even by his own standards. Compare with the face full of life and beauty in the below detail belonging to Lady Seated at the Virginal, a work painted in the same years.
(click on image for the full painting)

Jan Vermeer -
A Lady Seated at a Virginal, detail (c.1673)
If you are only a bit curious, then you will click on the above detail to view the whole painting. It is a magnificent master piece that unlike the work that has motivated this post, features the many exquisite (though very probably unfinished) details that are typical of Vermeer's works. What a difference indeed!
Finally, apart from this work, and unlike other great masters with high percentages of works clearly not their own but none-the-less attributed to them, I cannot say there is any other painting in Vermeer's catalog that is not clearly a master work.
Best Wishes,
Luis Miguel Goitizolo