To Glaze Or Not To Glaze

WIP (maybe?): I’m undecided as to whether or not to go further on this portrait. I like the grisaille and I’m reluctant to put any colour on this. Whenever I use Titian’s techniques (as opposed to Caravaggio’s, my normal method) something always seems amiss with the glazing – it’ll look great in the flesh, but will not photograph well.