Both museums are in former palaces, so it's often the rooms themselves on display, like this parlor. The windows on the right look out over a vast lawn and gardens.
The main attraction is Karl Brullov's enormous "The Last Day of Pompeii." It goes from floor to ceiling.
And I liked this rather different rendering of "The Last Supper" by Nikolai Ghe. The dark figure in the foreground is Judas. You can't tell from the picture how sinister he looks.
Ssh, don't tell anyone: I took these pix without paying the 200 ruble fee (about $10).