The dead bulb in there looks possibly rotted
(the pleated foliage I see appears to be a plant behind this one?)
I agree the pot looks too big. I would actually suspected rotted roots rather than underwatering (too large a pot takes longer to dry).
Re: pleated foliage and low humidity - I haven't had problems from low humidity causing pleated foliage in potted plants, only from underwatering, or rotted roots