For me, too much white, not enough variation in tone. The third one in particular looks just like a white rectangle.
If the brightness was reduced, then I feel that these could be alot better, particularly the second one, which I like. At the moment, it's hard not to feel blinded by the white.
EDIT: I just moved my monitor slightly, and the variation in tone has increased. Maybe only subtly adjust it, as now it doesn't appear to need hugely drastic changes.